fix: fix signer in the commission rate message (backport #2107)

[mergify]

Description

Issuing a MsgSetConsumerCommissionRate message was giving us back:

gaiad tx provider set-consumer-commission-rate pion-1 0.15 --from apple --gas auto --gas-adjustment 2 --gas-prices 0.005uatom -y
Error: rpc error: code = Unknown desc = rpc error: code = Unknown desc = no cosmos.msg.v1.signer option found for message interchain_security.ccv.provider.v1.MsgSetConsumerCommissionRate;

We added the signer but we still received that the address is missing.

This PR fixes this issue by setting the Signer field in the message. After this PR changes, when we issue a
MsgSetConsumerCommissionRate against a local gaiad node we get:

failed to execute message; message index: 0: unknown consumer chain, with id: chain-1: no consumer chain with this chain id'

which means the message got parsed correctly and was about to be handled.

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• Included the correct type prefix in the PR title
• Added ! to the type prefix if the change is state-machine breaking
• Confirmed this PR does not introduce changes requiring state migrations, OR migration code has been added to consumer and/or provider modules
• Targeted the correct branch (see PR Targeting)
• Provided a link to the relevant issue or specification
• Followed the guidelines for building SDK modules
• Included the necessary unit and integration tests
• Added a changelog entry to CHANGELOG.md
• Included comments for documenting Go code
• Updated the relevant documentation or specification
• Reviewed "Files changed" and left comments if necessary
• Confirmed all CI checks have passed
• If this PR is library API breaking, bump the go.mod version string of the repo, and follow through on a new major release

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed ! the type prefix if the change is state-machine breaking
• confirmed this PR does not introduce changes requiring state migrations, OR confirmed migration code has been added to consumer and/or provider modules
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage

Summary by CodeRabbit

• New Features

  • Enhanced transaction validation by including a signer address in the consumer commission rate message creation.

• Bug Fixes

  • Minor structural adjustment to the message definition for improved clarity, with no impact on functionality.

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This is an automatic backport of pull request #2107 done by [Mergify](https://mergify.com).