[IBC] Implement an IBC Wasm client implementation for Tendermint chains

[h5law]

Objective

Implement an ICS-08 implementation of the Tendermint client for the tracking and verification of tendermint chains.

This implementation should adhere to ICS-02 and be a WASM binary that can be used in the ICS-08 implementation as an IBC light client to track, update, check for misbehaviour, verify state, etc for the cosmos ecosystem.

The ibc-rs library can be utilised for this light client, and other tendermint ICS-08 (CosmWasm) implementations can also be referenced.

Origin Document

Issue #912

Goals

• Create an IBC Wasm light client for tendermint chains
• Fully satisfy ICS-02 and ICS-08

Deliverable

• WASM binary of a tendermint light client
• Be able to pass in serialised data/payloads to the WASM client
• Enable the use of imported functions from the golang host
• Enable the return of values from the WASM binary

Non-goals / Non-deliverables

• Change the ICS-02 interfaces
• Implement a CosmWasm light client

General issue deliverables

• Update the appropriate CHANGELOG(s)
• Update any relevant local/global README(s)
• Update relevant source code tree explanations
• Add or update any relevant or supporting mermaid diagrams

Testing Methodology

• Task specific tests or benchmarks: make ...
• New tests or benchmarks: make ...
• All tests: make test_all
• LocalNet: verify a LocalNet is still functioning correctly by following the instructions at docs/development/README.md
• k8s LocalNet: verify a k8s LocalNet is still functioning correctly by following the instructions here

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Creator: @h5law
Co-Owners: @h5law