feat!: provider proposal for changing reward denoms (backport #1280)

[mergify]

This is an automatic backport of pull request #1280 done by Mergify.
Cherry-pick of 48a2186 has failed:

On branch mergify/bp/release/v2.1.x-provider-lsm/pr-1280
Your branch is up to date with 'origin/release/v2.1.x-provider-lsm'.

You are currently cherry-picking commit 48a2186.
  (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:   docs/docs/features/proposals.md
	modified:   tests/e2e/main.go
	modified:   tests/e2e/steps_democracy.go
	modified:   tests/e2e/steps_reward_denom.go
	modified:   x/ccv/provider/handler.go
	modified:   x/ccv/provider/keeper/msg_server.go
	modified:   x/ccv/provider/keeper/proposal.go
	modified:   x/ccv/provider/proposal_handler.go
	modified:   x/ccv/provider/types/msg.go
	modified:   x/ccv/provider/types/proposal_test.go
	modified:   x/ccv/types/events.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   app/provider/app.go
	both modified:   proto/interchain_security/ccv/provider/v1/provider.proto
	both modified:   proto/interchain_security/ccv/provider/v1/tx.proto
	both modified:   tests/e2e/actions.go
	both modified:   tests/integration/distribution.go
	both modified:   x/ccv/provider/client/cli/tx.go
	both modified:   x/ccv/provider/client/proposal_handler.go
	both modified:   x/ccv/provider/keeper/distribution.go
	deleted by them: x/ccv/provider/keeper/distribution_test.go
	both modified:   x/ccv/provider/proposal_handler_test.go
	both modified:   x/ccv/provider/types/codec.go
	both modified:   x/ccv/provider/types/proposal.go
	both modified:   x/ccv/provider/types/provider.pb.go
	both modified:   x/ccv/provider/types/tx.pb.go

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

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