fix: update light account dummy signature for v2

[jaypaik]

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)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
• Did you run lint (yarn lint:check) and fix any issues? (yarn lint:write)
• Did you follow the contribution guidelines?

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PR-Codex overview

The focus of this PR is to update the LightAccount functionality to support different versions and improve testing coverage.

Detailed summary

• Added switch statement in getDummySignature to handle different versions
• Updated tests to cover different versions of LightAccount
• Added LightAccountVersion type and AccountVersionRegistry
• Improved handling of different versions in encodeUpgradeToAndCall and givenConnectedProvider

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