feat: adding ConsensusHost interface for custom self client/consensus state validation (backport #6055)

[mergify]

Description

Co-authored-by: chatton github.qpeyb@simplelogin.fr

Adds the ConsensusHost interface type to 02-client as well as implementation for 07-tendermint and 08-wasm.

closes: #5315

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• Linked to GitHub issue with discussion and accepted design, OR link to spec that describes this work.
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• Wrote unit and integration tests.
• Updated relevant documentation (docs/).
• Added relevant godoc comments.
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Summary by CodeRabbit

• New Features
  • Improved blockchain interoperability by introducing a WasmConsensusHost struct for wasm-wrapped consensus in the IBC package.
• Tests
  • Ensured reliability and robustness through extensive testing of the new wasm consensus mechanism in diverse scenarios.

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This is an automatic backport of pull request #6055 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 50d2a08 has failed:

On branch mergify/bp/release/v8.3.x/pr-6055
Your branch is up to date with 'origin/release/v8.3.x'.

You are currently cherry-picking commit 50d2a087.
  (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:   modules/core/02-client/abci.go
	modified:   modules/core/02-client/keeper/migrations.go
	modified:   modules/core/02-client/migrations/v7/genesis_test.go
	modified:   modules/core/02-client/proposal_handler.go
	modified:   modules/core/02-client/types/client.go
	modified:   modules/core/02-client/types/genesis_test.go
	modified:   modules/core/03-connection/keeper/handshake_test.go
	modified:   modules/core/genesis.go
	modified:   modules/core/keeper/keeper.go
	deleted:    modules/core/keeper/migrations.go
	modified:   modules/core/migrations/v7/genesis_test.go
	new file:   modules/light-clients/07-tendermint/consensus_host.go
	new file:   modules/light-clients/07-tendermint/consensus_host_test.go
	new file:   modules/light-clients/08-wasm/types/consensus_host.go
	new file:   modules/light-clients/08-wasm/types/consensus_host_test.go
	new file:   testing/mock/consensus_host.go
	modified:   testing/simapp/upgrades.go
	modified:   testing/simapp/upgrades/upgrades.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   modules/core/02-client/keeper/keeper.go
	both modified:   modules/core/02-client/keeper/keeper_test.go
	both modified:   modules/core/02-client/types/errors.go
	deleted by us:   modules/light-clients/08-wasm/testing/simapp/app.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

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[crodriguezvega]

Thank you for the effort to make it not API breaking. 🙏

[chatton]

LGTM, think we landed on a solid non-api breaking solution 🥇