This change adds additional coverage to the `mConnConnection.TrySendMessage` code path. Adds test to ensure it returns `io.EOF` when closed.

Addresses: #6570

This changes adds an `MempoolError` field to the `ResponseCheckTx`. This will allow clients to understand that their transaction was rejected from the mempool despite passing the ABCI check. 

This change also updates the code to make use of early returns to prevent highly nested code blocks. Namely, it returns when the type assertion fails at the beginning of the method, instead of wrapping the entire method in a large if statement. This has a somewhat large effect on the diff as rendered by github.

addresses: #3546

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 1.5.2 to 2.0.1.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/master/CHANGELOG.md)
- [Commits](https://github.com/codecov/codecov-action/compare/v1.5.2...v2.0.1)

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Co-authored-by: Sam Kleinman <garen@tychoish.com>

The Makefile at the root of the repo [includes](cd19ef244e/Makefile (L61)) the Makefile under the `test` package. This fix removes the target defined in the root Makefile in favor of the included one.

Having looked at our network address parsing and connection code, it
really looks like we're not doing anything on top of what the standard
library is doing (both in terms using `net.ParseIP` and also
`net.Dial`,) and I don't think we need to run the tests 2x the number
of times just to run through different areas of the standard
library. I think most of our users are going to be using IPv4, and
would be down to fully remove this dimension as well, if we find it's
making noise, but for now I think it's fine.

closes #2498 
solves part of #3365

Note: difficult to test the event emit in SwitchToFastSync part, might need to change `stateSyncReactor` to an interface in the `nodeImpl` struct

There are many `//go:generate mockery` lines in the source code.
This change adds a make target to invoke these mock generations.
This change also invokes the mock invocations and adds the resulting mocks to the repo.

Related to #5274

## Description

Remove v2 flag from toml

## Description

Mark gRPC as deprecated in the RPC layer. 

closes #6718

Bumps [actions/stale](https://github.com/actions/stale) from 3.0.19 to 4.
- [Release notes](https://github.com/actions/stale/releases)
- [Changelog](https://github.com/actions/stale/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/stale/compare/v3.0.19...v4)

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This tweaks sleeps around pertubations, based on a theory that our
tests with "kill" pertubations restart the nodes fast enough the peers
haven't marked it down when it tries to reconnect. In my local test
runs, this clears out *most* of the test failures that I've seen,
except for one evidence-related test-harness problem (which should be
handled separately.)

## Description 

Fix broken links

closes #6695

This code change amends the dispatcher tests to read from the dispatcher's `requestCh`. This ensures that a request is waiting when the test calls `dispatcher.respond`. 
addresses: #6711

Bumps [github.com/google/uuid](https://github.com/google/uuid) from 1.2.0 to 1.3.0.
- [Release notes](https://github.com/google/uuid/releases)
- [Commits](https://github.com/google/uuid/compare/v1.2.0...v1.3.0)

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* statesync: remove outgoing calls race condition

* Revert "statesync: keep peer despite lightblock query fail (#6692)"

This reverts commit 50b00dff71.

* remove counter app

* remove unneeeded ci

* lint fix

* modify tx sizes

* cleanup docs

* Update abci/cmd/abci-cli/abci-cli.go

Co-authored-by: Callum Waters <cmwaters19@gmail.com>

* Update docs/app-dev/getting-started.md

Co-authored-by: Callum Waters <cmwaters19@gmail.com>

* Update docs/app-dev/getting-started.md

Co-authored-by: Callum Waters <cmwaters19@gmail.com>

* bring back comment

* migrate to kvstore and not persistent

* remove unused func

* test persistent

Co-authored-by: Callum Waters <cmwaters19@gmail.com>

When a peer responds with no lightblock for the height we queried, we call the [removePeer method](https://github.com/tendermint/tendermint/blob/master/internal/statesync/reactor.go#L339). This removes the peer from the [dispatcher's list of called peer's](ad65883152/internal/statesync/dispatcher.go (L159)). When the dispatcher then receives responses from the removed peer, it [drops their responses](ad65883152/internal/statesync/dispatcher.go (L130)). These responses may be meaningful or contain a block or data that will help statesync proceed.

[The logs](https://gist.github.com/tychoish/34a1f61eaae3c36c23efc7d0001e805c), when this change is applied, show an additional 3 networking testnets passing. 

addresses:  #6691

## Description

Move tools to subdir to fix `go get`

I put this error log in here because I thought it might be a helpful indicator to see when a reactor sends a message to a peer that doesn't have that channel open but it turns out this is happening all the time and it's kind of annoying

Bumps [github.com/golangci/golangci-lint](https://github.com/golangci/golangci-lint) from 1.38.0 to 1.41.1.
- [Release notes](https://github.com/golangci/golangci-lint/releases)
- [Changelog](https://github.com/golangci/golangci-lint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/golangci/golangci-lint/compare/v1.38.0...v1.41.1)

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## Description

Run go mod tidy

Bumps [gaurav-nelson/github-action-markdown-link-check](https://github.com/gaurav-nelson/github-action-markdown-link-check) from 1.0.12 to 1.0.13.
- [Release notes](https://github.com/gaurav-nelson/github-action-markdown-link-check/releases)
- [Commits](https://github.com/gaurav-nelson/github-action-markdown-link-check/compare/1.0.12...1.0.13)

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