Added ICAOracle route implementations for legacy Msg type

[sampocs]

Closes: #XXX

Context and purpose of the change

Ledger transactions require each message to implement the legacy sdk.Msg type. The oracle messages did not implement the Route function of the interface, which caused ledger transactions to fail with the following error:

panic: expected *legacytx.LegacyMsg when using amino JSON

Brief Changelog

• Implemented Route function for the following oracle transactions:
  • AddOracle
  • RemoveOracle
  • ToggleOracle
  • InstantiateOracle
  • RestoreOracleICA

Testing

@riley-stride recreated the error in dockernet and confirmed adding the Route implementation resolved the error.

Note to Future Selves

Make sure to implement the legacy interface for ledger transactions.

Author's Checklist

I have...

• Run and PASSED locally all GAIA integration tests
• If the change is contentful, I either:
  • Added a new unit test OR
  • Added test cases to existing unit tests
• OR this change is a trivial rework / code cleanup without any test coverage

If skipped any of the tests above, explain.

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...

• reviewed state machine logic
• reviewed API design and naming
• manually tested (if applicable)
• confirmed the author wrote unit tests for new logic
• reviewed documentation exists and is accurate

Documentation and Release Note

• Does this pull request introduce a new feature or user-facing behavior changes?
• Is a relevant changelog entry added to the Unreleased section in CHANGELOG.md?
• This pull request updates existing proto field values (and require a backend and frontend migration)?
• Does this pull request change existing proto field names (and require a frontend migration)?
  How is the feature or change documented?
  • not applicable
  • jira ticket XXX
  • specification (x/<module>/spec/)
  • README.md
  • not documented

[riley-stride]

Looks good. Tested add and instantiate on dockernet with ledger and ledger multisig but not remove or restore or toggle.

[sampocs]

remove/restore/toggle are all gov functions so no need to test!