feat: add oldest_unconfirmed_vsc query (backport #1740)

[mergify]

Description

Closes: #1263

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Author Checklist

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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

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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

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This is an automatic backport of pull request #1740 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 60c4fd0 has failed:

On branch mergify/bp/release/v4.1.x-lsm/pr-1740
Your branch is up to date with 'origin/release/v4.1.x-lsm'.

You are currently cherry-picking commit 60c4fd0.
  (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:
	new file:   .changelog/unreleased/features/provider/1740-oldest-unconfirm-vsc-query.md
	modified:   proto/interchain_security/ccv/provider/v1/query.proto
	modified:   x/ccv/consumer/ibc_module.go
	modified:   x/ccv/provider/client/cli/query.go
	modified:   x/ccv/provider/ibc_module.go
	modified:   x/ccv/provider/keeper/grpc_query.go
	modified:   x/ccv/provider/keeper/grpc_query_test.go
	modified:   x/ccv/provider/types/errors.go
	modified:   x/ccv/provider/types/provider.pb.go
	modified:   x/ccv/provider/types/query.pb.go
	modified:   x/ccv/provider/types/query.pb.gw.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   .changelog/v3.2.0/features/consumer/1164-provider-info-query.md

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