feat: add grpc api related to the block

[brew0722]

Description

• Add below API to integrate with grpc.
  BlockByHash, BlockResultsByHeight

• Add prove parameter to GetTxsEvent API.
  In the existing case, prove is hard-coded to true, which shows slow performance.

• Migrate swagger-gen.

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@7ecb96e). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #291   +/-   ##
=======================================
  Coverage        ?   52.85%           
=======================================
  Files           ?      639           
  Lines           ?    47548           
  Branches        ?        0           
=======================================
  Hits            ?    25132           
  Misses          ?    19518           
  Partials        ?     2898           

[egonspace]

LGTM

[egonspace]

CHANGELOG also needs to be updated.

[zemyblue]

@brew0722 Could you change the location of wasm's protobuf files?

[brew0722]

@zemyblue
The legacy wasm proto paths will be resolved in cosmwasm/wasmd 0.17.0 migration PR.
https://github.com/CosmWasm/wasmd/tree/v0.17.0/proto/cosmwasm/wasm/v1beta1
#249 (As a result of rechecking, that was missing in PR#249. Thank you.)

@slave5vw Could you change the location of wasm's protobuf files?