feat: implement CosmWasm context for light clients + contract for Tendermint clients

[Farhad-Shabani]

Comes after: #1163

Closes: #1164 Closes: #1165

Subsequent PR on sovereign-ibc: https://github.com/informalsystems/sovereign-ibc/pull/142

Description

This PR adds the following crates:

• ibc-client-cw A library providing ready-made Context object to facilitate CosmWasm integration
• ibc-client-tendermint-cw: Implemtens CosmWasm contract for ICS-07 Tendermint light clients

Plus, wrote unit tests for Tendermint CosmWasm client creation / update / recovery.

TODO in follow-up PRs

• Include CI job to check the make build-tendermint-cw
• Add Nix flake to build ibc_client_tendermint_cw.wasm file
• Write macro to auto-generate the entrypoints and handle some required conversions.

---

PR author checklist:

• [X] Added changelog entry, using unclog.
• [X] Linked to GitHub issue.
• [X] Updated code comments and documentation (e.g., docs/).
• [x] Tagged one reviewer who will be the one responsible for shepherding this PR.

Reviewer checklist:

• [ ] Reviewed Files changed in the GitHub PR explorer.
• [ ] Manually tested (in case integration/unit/mock tests are absent).

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 61.76024% with 252 lines in your changes are missing coverage. Please review.

Project coverage is 64.39%. Comparing base (45d3250) to head (702272b). Report is 1 commits behind head on main.

Files	Patch %	Lines
ibc-clients/cw-context/src/handlers.rs	46.15%	63 Missing :warning:
ibc-clients/cw-context/src/context/client_ctx.rs	57.97%	58 Missing :warning:
ibc-clients/cw-context/src/types/msgs.rs	23.18%	53 Missing :warning:
ibc-clients/cw-context/src/context/mod.rs	76.47%	40 Missing :warning:
ibc-clients/cw-context/src/context/custom_ctx.rs	81.25%	9 Missing :warning:
ibc-clients/cw-context/src/types/response.rs	74.28%	9 Missing :warning:
ibc-clients/cw-context/src/types/error.rs	0.00%	7 Missing :warning:
...nts/ics07-tendermint/cw-contract/src/entrypoint.rs	75.00%	5 Missing :warning:
...ts/ics07-tendermint/cw-contract/src/client_type.rs	82.60%	4 Missing :warning:
ibc-clients/cw-context/src/utils/mod.rs	72.72%	3 Missing :warning:
... and 1 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1167 +/- ## ========================================== + Coverage 63.73% 64.39% +0.66% ========================================== Files 219 230 +11 Lines 21399 22053 +654 ========================================== + Hits 13638 14201 +563 - Misses 7761 7852 +91 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.