feat: Cosmos SDK Module

[yjamin]

Description

This PR adds Agent support for the upcoming Hyperlane Cosmos SDK Module, called CosmosNative, to differentiate it from the existing CosmWasm (CW) implementation.

Drive-by Fixes

• Fixed sequence-aware backward cursor issue – The cursor was incorrectly including block height 0, which isn’t valid for Cosmos-based chains.

Related Issues

• None reported.

Backward Compatibility

• No breaking changes—this PR extends functionality without affecting existing implementations.

Testing

The CosmosNative implementation has been tested through:

• Automated E2E tests – Following the same approach as the CW implementation.
• Deployed preview – Currently live on the alpha network for additional validation.

E2E Testing Details

• They pretty much follow the same structure as the CW tests.
• They spin up a lightweight Cosmos SDK chain (simapp) with the Hyperlane Cosmos module.

Note: The simapp includes a preview version of the Hyperlane module since it's not officially released yet.

To run the tests locally, use:

cargo test -r -p run-locally --features cosmosnative -- cosmosnative::test --nocapture

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Latest commit: 8670421

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