fix: Implement LegacyGovUpdateParams for querying legacy proposals (backport #476)

[mergify[bot]]

Description

closes: #XXXX

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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 API or client breaking change
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• [ ] targeted the correct branch
• [ ] provided a link to the relevant issue or specification
• [ ] added a changelog entry to CHANGELOG.md
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Reviewers Checklist

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• [ ] confirmed the correct type prefix in the PR title
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• [ ] reviewed documentation is accurate
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• [ ] manually tested (if applicable)

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  This is an automatic backport of pull request #476 done by Mergify.

[mergify[bot]]

Cherry-pick of 71d54a43127545ca36e817a16def9b6e20f3515b has failed:

On branch mergify/bp/release/v0.3.x/pr-476
Your branch is up to date with 'origin/release/v0.3.x'.

You are currently cherry-picking commit 71d54a4.
  (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:   proto/ojo/oracle/v1/tx.proto
    modified:   x/oracle/keeper/msg_server.go
    modified:   x/oracle/types/codec.go
    modified:   x/oracle/types/proposal.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
    both modified:   app/upgrades.go
    both modified:   x/oracle/types/msgs.go
    both modified:   x/oracle/types/tx.pb.go

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