chore: rename SubmitTx to SendTx (backport #2255)

[mergify]

This is an automatic backport of pull request #2255 done by Mergify.
Cherry-pick of a4be561 has failed:

On branch mergify/bp/release/v6.0.x/pr-2255
Your branch is up to date with 'origin/release/v6.0.x'.

You are currently cherry-picking commit a4be561.
  (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:   modules/apps/27-interchain-accounts/controller/client/cli/tx.go
	modified:   modules/apps/27-interchain-accounts/controller/types/msgs.go
	modified:   modules/apps/27-interchain-accounts/controller/types/msgs_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   docs/ibc/proto-docs.md
	both modified:   modules/apps/27-interchain-accounts/controller/client/cli/cli.go
	both modified:   modules/apps/27-interchain-accounts/controller/keeper/msg_server.go
	both modified:   modules/apps/27-interchain-accounts/controller/keeper/msg_server_test.go
	both modified:   modules/apps/27-interchain-accounts/controller/types/codec.go
	both modified:   modules/apps/27-interchain-accounts/controller/types/tx.pb.go
	both modified:   proto/ibc/applications/interchain_accounts/controller/v1/tx.proto

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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[lgtm-com]

This pull request introduces 1 alert when merging c220bbc into 9e9f267 - view on LGTM.com

new alerts:

• 1 for Unreachable statement