feat: add a query to retrieve validator set that was last sent to the consumer chain

[insumity]

Description

Closes: #XXXX

This PR introduces a query to retrieve the validator set that was last sent to the consumer chain. Note that this does not necessarily mean that the consumer chain is using this validator set because a VSCPacket could be delayed, etc.

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Author Checklist

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• [x] Included the correct type prefix in the PR title
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• [x] Confirmed this PR does not introduce changes requiring state migrations, OR migration code has been added to consumer and/or provider modules
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• [ ] Provided a link to the relevant issue or specification
• [ ] Followed the guidelines for building SDK modules
• [x] Included the necessary unit and integration tests
• [x] Added a changelog entry to CHANGELOG.md
• [ ] Included comments for documenting Go code
• [x] Updated the relevant documentation or specification
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• [ ] If this PR is library API breaking, bump the go.mod version string of the repo, and follow through on a new major release

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• [ ] 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
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• [ ] reviewed tests and test coverage

Summary by CodeRabbit

• New Features
  • Introduced a new query feature to fetch the latest set of consumer validators for a specific consumer chain. This enhancement allows users to retrieve up-to-date validator information efficiently.

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Commits

Files that changed from the base of the PR and between edef130ffaf0a49583b2cb00bc87af4b103e8101 and 258a807b6837a8c3c158b6df43d5f088d1729b27.

Walkthrough

The update introduces a new query, consumer-validators, to fetch the latest set of consumer validators for a specified consumer chain. This involves adding a new RPC method, message types, CLI command, and corresponding tests. Documentation has been updated to reflect these changes, including instructions on how to use the new query and a warning about the possible discrepancy between the returned validators and the current validator set.

Changes

Files / Paths	Change Summary
.changelog/unreleased/features/provider/1867-add-query-for-latest-consumer-validator-set.md	Added summary for the new consumer-validators query.
proto/interchain_security/ccv/provider/v1/query.proto	Introduced QueryConsumerValidators RPC method and associated message types.
x/ccv/provider/client/cli/query.go	Added CmdConsumerValidators() command to query consumer validators by chain ID.
x/ccv/provider/keeper/grpc_query.go	Added QueryConsumerValidators function to retrieve consumer validators for a chain.
x/ccv/provider/keeper/grpc_query_test.go	Added tests for various query scenarios related to consumer validators.
docs/docs/validators/partial-set-security-for-validators.md	Updated section header and added instructions on retrieving consumer validators, including a warning.

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