test: Add CLI, gRPC, MsgServer tests (backport #1405)

[mergify]

Description

closes: #XXXX

Test coverage reached over 80%

Motivation and context

How has this been tested?

Screenshots (if appropriate):

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly.
• I have updated API documentation client/docs/swagger-ui/swagger.yaml

---

This is an automatic backport of pull request #1405 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 97219d5 has failed:

On branch mergify/bp/release/v0.49.x/pr-1405
Your branch is up to date with 'origin/release/v0.49.x'.

You are currently cherry-picking commit 97219d5ee.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	new file:   client/tendermint.go
	modified:   init_node.sh
	new file:   testutil/cli/tm_mocks.go
	new file:   types/module/testutil/codec.go
	modified:   x/fbridge/client/cli/query.go
	new file:   x/fbridge/client/cli/query_test.go
	modified:   x/fbridge/client/cli/tx.go
	new file:   x/fbridge/client/cli/tx_test.go
	new file:   x/fbridge/keeper/abci_test.go
	modified:   x/fbridge/keeper/auth.go
	modified:   x/fbridge/keeper/auth_test.go
	new file:   x/fbridge/keeper/genesis_test.go
	new file:   x/fbridge/keeper/grpc_query_test.go
	new file:   x/fbridge/keeper/msg_server_test.go
	new file:   x/fbridge/types/fbridge_test.go
	new file:   x/fbridge/types/keys_test.go
	modified:   x/fbridge/types/params_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[codecov]

Codecov Report

Attention: Patch coverage is 13.72549% with 44 lines in your changes missing coverage. Please review.

Project coverage is 69.68%. Comparing base (8c5ab7e) to head (fd51ac6).
Report is 1 commits behind head on release/v0.49.x.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           release/v0.49.x    #1430      +/-   ##
===================================================
+ Coverage            68.75%   69.68%   +0.93%     
===================================================
  Files                  754      756       +2     
  Lines                75837    75883      +46     
===================================================
+ Hits                 52139    52882     +743     
+ Misses               21042    20310     -732     
- Partials              2656     2691      +35     

Files	Coverage Δ
x/fbridge/client/cli/query.go	72.38% <100.00%> (+72.38%)	⬆️
x/fbridge/client/cli/tx.go	92.00% <100.00%> (+92.00%)	⬆️
x/fbridge/keeper/auth.go	86.61% <0.00%> (+30.96%)	⬆️
testutil/cli/tm_mocks.go	0.00% <0.00%> (ø)
types/module/testutil/codec.go	0.00% <0.00%> (ø)

... and 10 files with indirect coverage changes