Add support for Namada

[yito88]

Closes: #XXX

Description

To transfer tokens between Namada and Cosmos-base chains.

• Add Namada to ChainConfig
• Reuse CosmosSdkConfig for generating Tendermint light clients
• Add NamadaChain as ChainEndpoint implementation
  • See crates/relayer/src/chain/namada.rs and files under crates/relayer/src/chain/namada
  • To submit Namada transactions and query
• Store Namada key to KeyRing

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PR author checklist:

• Added changelog entry, using unclog.
• Added tests: integration (for Hermes) or unit/mock tests (for modules).
• Linked to GitHub issue.
• Updated code comments and documentation (e.g., docs/).
• 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).

[ljoss17]

Some small nits for error upstreaming

[ljoss17]

Added some nits.
In addition:

• For the MSRV, it needs to be updated to v1.79.0 due to [email protected] requires rustc 1.79.0
• For cargo doc, we can use the stable toolchain instead of nightly-2024-04-21

[ljoss17]

Sorry it seems that for cargo doc we need the nightly build, toolchain: nightly-2024-10-15 should work.
For the Rust MSRV we can update cargo msrv to v0.17.1 and remove the -- 'cargo check --all-features' from the CLI call