Add documentation comments to the psql event sink package, and simplify the
constructor function so that it does not return the SQL database handle.  The
handle is needed for testing, so expose that via a separate method on the
concrete type.

Update the tests and existing usage for the change. This change does not affect
the behaviour of the sink, so there are no functional changes, only syntactic
updates.

EDIT: Updated, see [comment below]( https://github.com/tendermint/tendermint/pull/6785#issuecomment-897793175)

This change adds a sketch of the `Debug` mode. 

This change adds a `Debug` struct to the node package. This `Debug` struct is intended to be created and started by a command in the `cmd` directory. The `Debug` struct runs the RPC server on the data directories: both the state store and the block store.

This change required a good deal of refactoring. Namely, a new `rpc.go` file was added to the `node` package. This file encapsulates functions for starting RPC servers used by nodes. A potential additional change is to further factor this code into shared code _in_ the `rpc` package. 

Minor API tweaks were also made that seemed appropriate such as the mechanism for fetching routes from the `rpc/core` package.

Additional work is required to register the `Debug` service as a command in the `cmd` directory but I am looking for feedback on if this direction seems appropriate before diving much further.

closes: #5908

* docs: add indexer godoc

* docs++

* docs++

* docs++

* docs++

* docs++

* Update state/indexer/doc.go

Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

* Update state/indexer/doc.go

Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

* Update state/indexer/doc.go

Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

* Update state/indexer/doc.go

Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

* Update state/indexer/doc.go

Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

* Update state/indexer/doc.go

Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

* docs++

Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

This change aims to keep versions of mockery consistent across developer laptops.

This change adds mockery to the `tools.go` file so that its version can be managed consistently in the `go.mod` file.

Additionally, this change temporarily disables adding mockery's version number to generated files. There is an outstanding issue against the mockery project related to the version string behavior when running from `go get`. I have created a pull request to fix this issue in the mockery project.
see: https://github.com/vektra/mockery/issues/397

Update those break statements inside case clauses that are intended to reach an
enclosing for loop, so that they correctly exit the loop.

The candidate files for this change were located using:

    % staticcheck -checks SA4011 ./... | cut -d: -f-2

This change is intended to preserve the intended semantics of the code, but
since the code as-written did not have its intended effect, some behaviour may
change. Specifically: Some loops may have run longer than they were supposed
to, prior to this change.

In one case I was not able to clearly determine the intended outcome. That case
has been commented but otherwise left as-written.

Fixes #6780.

This is a mostly-automated fixup using Comby (https://comby.dev) to remove 
lexically-obvious redundant error checks. No functional changes are intended.

To reproduce the core change:

    # Collapse redundant error check conditionals
    % comby -in-place 'if err != nil {
       return err
    }
    return nil' 'return err' .go

    # Fold out unnecessary error temporaries
    % comby -in-place ':[spc~^\s*]err :[~:?]= :[any]
       return err' ':[spc]return :[any]' .go

Fixes #6479 and related cases.

Closes: #6661 

Note: see another error during the events indexing, guess the raw tx size exceeds the limitation?
```
3:17PM ERR failed to index block txs err="pq: index row size 2768 exceeds btree version 4 maximum 2704 for index \"tx_results_tx_result_key\"" height=5205112 module=txindex

* docs: update events

* lint++

* lint++

This reverts commit 167fa738a3.

copy 🍝  bug when porting similar logic from the tx indexing code.