Rethrow the original eth_sendTransaction error if wallet_sendTransaction isn't supported

[alcuadrado]

This is an initial stub at rethrowing the original eth_sendTransaction error if wallet_sendTransaction error isn't supported.

I also modified the code a bit, so that wallet_sendTransaction is only tried once per client if not supported.

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PR-Codex overview

This PR focuses on improving error handling in the sendTransaction function by ensuring that original errors are rethrown when the wallet_sendTransaction method is not supported. It enhances the logic for determining method support and improves test coverage.

Detailed summary

• Fixed error bubbling for sendTransaction when wallet_sendTransaction isn't supported.
• Introduced a check to determine if the wallet namespace is supported.
• Updated error handling to rethrow original errors for unsupported methods.
• Added a test to verify behavior when wallet_sendTransaction is unsupported.

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🦋 Changeset detected

Latest commit: 9d4e917

The changes in this PR will be included in the next version bump.

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