refactor(ethexe-cli): use sdk for ethexe-cli tx subcommand

[playX18]

Closes #5111

Summary

Transitioned ethexe-cli tx to use ethexe-sdk as the transaction-facing API instead of constructing ethexe_ethereum and Vara.ETH RPC clients directly.

This adds SDK builder/default helpers, supports Ethereum-only SDK instances, keeps Vara.ETH RPC optional for RPC-dependent calls, and re-exports only the data types needed by the
CLI.

How to test

  cargo fmt --check
  cargo check -p ethexe-sdk
  cargo check -p ethexe-cli

Notes

No breaking CLI behavior is intended. ethexe-cli no longer depends directly on ethexe-ethereum or jsonrpsee for tx flows.

Checklist

• PR title follows Conventional Commits (type(scope): description)
• Single logical change
• Tests added or updated (if logic changed)
• Docs updated (if needed)

[gemini-code-assist]

Summary of Changes

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This pull request refactors the ethexe-cli transaction subcommand to utilize the ethexe-sdk as the primary interface. By abstracting the transaction-facing API, the CLI codebase is simplified and becomes less coupled to underlying RPC implementation details. The SDK has been improved with a builder pattern and support for optional RPC clients, enhancing its usability and flexibility for various deployment scenarios.

Highlights

• Refactoring Transaction Flows: Transitioned ethexe-cli transaction logic to use the ethexe-sdk, reducing direct dependencies on ethexe-ethereum and jsonrpsee.
• SDK Enhancements: Introduced VaraEthApiBuilder to support flexible SDK configuration, including support for Ethereum-only instances where Vara.ETH RPC is optional.
• Dependency Management: Cleaned up Cargo.toml and Cargo.lock by removing redundant dependencies and centralizing configuration through the SDK.

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[gemini-code-assist]

Code Review

This pull request refactors the ethexe CLI and SDK to integrate the new ethexe-sdk crate, replacing direct dependencies on ethexe-ethereum and jsonrpsee. It introduces VaraEthApiBuilder for constructing VaraEthApi clients, supports optional WebSocket RPC configurations, and encapsulates injected transaction details into InjectedMessageResult. Feedback on the changes suggests enforcing mutual dependencies on CLI arguments using clap attributes and optimizing RPC calls in the query command to avoid duplicate state hash lookups.

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