fix: send sdk version on signer requests

[florrdv]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
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PR-Codex overview

This PR introduces the addition of a version header to the BaseSignerClient class, enhancing the API request with versioning information.

Detailed summary

• Added import for VERSION from ../version.js.
• Appended a new header "Alchemy-AA-Sdk-Version" with the value of VERSION in the BaseSignerClient class.

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