This commit changes the behaviour of the /unconfirmed_txs endpoint by replacing limit with a page and perPage parameter for pagination.
The test case for unconfirmed_txs have been accommodated to properly test this change and the documentation for the API as well.

This reverts commit 22e8aafa03.

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

Co-authored-by: Josef Widder <44643235+josef-widder@users.noreply.github.com>

Co-authored-by: William Banfield <4561443+williambanfield@users.noreply.github.com>

Co-authored-by: Josef Widder <44643235+josef-widder@users.noreply.github.com>

Co-authored-by: Josef Widder <44643235+josef-widder@users.noreply.github.com>

The custom error types in the provider package did not propagate their wrapped
underlying reasons, making it difficult for the test to check that the correct
error was observed.

- Fix the custom errors to have a true underlying error (not just a string).
- Add Unwrap methods to support inspection by errors.Is.
- Update usage in a few places.
- Fix the test to check for acceptable variation.

Fixes #7609.

After writing and then reading a bunch of random messages, the test was
checking that it did not read the same number of messages that it wrote.
The sense of this check was inverted; they should match.

Introduced by accident in #7522. I'm not sure why this did not show up in CI.

Edit: I now know why it didn't show up in ci: #7608.

Fixed typo in exchange

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

Add package jsontypes that implements a subset of the custom libs/json 
package. Specifically it handles encoding and decoding of interface types
wrapped in "tagged" JSON objects. It omits the deep reflection on arbitrary
types, preserving only the handling of type tags wrapper encoding.

- Register interface types (Evidence, PubKey, PrivKey) for tagged encoding.
- Update the existing implementations to satisfy the type.
- Register those types with the jsontypes registry.
- Add string tags to 64-bit integer fields where needed.
- Add marshalers to structs that export interface-typed fields.

Make sure it runs for pull requests as well as pushes to master.
Otherwise, I think, it may not trigger to satisfy the requirement.

* Fold in version bump from #385.

Co-authored-by: sweexordious <chamirachid1@gmail.com>

related to: #7274 and #7275 

Still somewhat uncertain on two things that I'd appreciate more feedback on:
1. The optional temporary local overrides. Perhaps this is superfluous and we can simply make the transition without the override?
2. If this set of parameters seems to be large enough to allow application developers to create the chains they want but not so large as to be needlessly complex.

Related to #7503

Fixes #7596.

The parameters for RPC GET requests are parsed from query arguments in the
request URL. Rework this code to remove the need for tmjson. The structure of a
call still requires reflection, and still works the same way as before, but the
code structure has been simplified and cleaned up a bit.

Points of note:

- Consolidate handling of pointer types, so we only need to dereference once.
- Reduce the number of allocations of reflective types.
- Report errors for unsupported types rather than returning untyped nil.

Update the tests as well. There was one test case that checked for an error on
a behaviour the OpenAPI docs explicitly demonstrates as supported, so I fixed
that test case, and also added some new ones for cases that weren't checked.

Related:

* Update e2e base Go image to 1.17 (to match config).

I missed this during my previous pass.

Requirements for handlers:

- First argument is context.Context.
- Last of two results is error.

Require that RPC functions take a context as their first argument, and return
an error as either their only result, or the second of two results.

This does not change how functions are dispatched, but will make it a little
easier to make more invasive changes in the near future.