chore: re-add IntProto and DecProto and deprecate msg (backport #22925)

[mergify]

Description

reverts half of: #16918
We shouldn't have removed the type, but only deprecated, as it was proto breaking and it is needed for migrating away from it.

catched by @damiannolan during IBC integration.

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Summary by CodeRabbit

Summary by CodeRabbit

• New Features

  • Introduced support for simulating nested messages and importing hex keys via standard input.
  • Added a new module for transaction validation.

• Improvements

  • Upgraded RocksDB libraries and streamlined integration tests.
  • Enhanced performance and compatibility of various libraries.

• Bug Fixes

  • Resolved issues with async pruning and improved error handling in gRPC query handlers.

• API Breaking Changes

  • Deprecated certain methods and types, including IntProto and DecProto, and renamed SetProtocolVersion to SetAppVersion.

• Documentation

  • Added comments to clarify fields in the GeneratorParams struct.
  • Updated the changelog to reflect the new version entry for the indexer project.

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This is an automatic backport of pull request #22925 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 0a89178 has failed:

On branch mergify/bp/release/v0.52.x/pr-22925
Your branch is up to date with 'origin/release/v0.52.x'.

You are currently cherry-picking commit 0a8917802.
  (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:
	modified:   CHANGELOG.md
	modified:   proto/cosmos/base/v1beta1/coin.proto
	modified:   types/coin.go
	modified:   types/coin.pb.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   api/cosmos/base/v1beta1/coin.pulsar.go
	deleted by us:   api/cosmos/benchmark/module/v1/module.pulsar.go
	deleted by us:   indexer/postgres/CHANGELOG.md
	both modified:   x/staking/types/staking.pb.go

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

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