Adapt to cometbft-rs

[mzabaluev]

Summary

Replace usage of tendermint-rs with cometbft-rs.

Problem Definition

Tendermint-rs is in maintenance mode while new development, particularly support for CometBFT 1.0, is now in cometbft-rs.

Another concern is that the changes done in cometbft-rs currently lack validation by a real-world project, and Hermes is a prime candidate for such a project.

Proposal

Replace dependencies on tendermint-rs crates with the corresponding crates of cometbft-rs. The changes will be mostly trivial: renaming crate imports, module paths, some type names. For side-by-side support of multiple CometBFT proto versions, the modules to use from cometbft-proto would be less straightforward, but there will be less duplication with the new proto-originated versioning of the message types.

Acceptance Criteria

No tendermint* crates in Hermes' dependency tree, replaced with cometbft*.

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