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Refactor WebAuthn Signature Validation Logic (#252)

This PR slightly refactors the WebAuthn signature validation logic in
preparation for sharing code when implementing #228.

Essentially, it creates a `SignatureValidator` abstract base class for
sharing that supports both legacy and current EIP-1271 functions. As a
consequence of the refactoring, `ISafeSingletonSigner` now uses
`bytes32` messages for signature validation instead of `bytes memory`,
in order to be more of an analogy to the current EIP-1271 standard
(instead of the legacy one).

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Co-authored-by: Mikhail <16622558+mmv08@users.noreply.github.com>

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