[DNM] Multi signer multi sig

[kalepail]

Adding in two new features:

• Support for ed25519 signers
• Support for a vector of Signers

So we have multisig now in the sense of

• both ed25519 and secp256r1 signers
• both persistent (admin) and temporary (session) signers
• support for verifying multiple signature payloads in a single invocation

UPDATE

• Support for verifying policy contracts as a type of signer

[kalepail]

Still waiting on:

• test coverage for ed25519 signers
• test coverage for multiple signatures in a single invocation
• updates and tests to ensure Zephyr indexing is working

[cloudflare-workers-and-pages]

Deploying passkey-kit-demo with    Cloudflare Pages

Latest commit:	138f1f2
Status:	✅  Deploy successful!
Preview URL:	https://224ca4bb.passkey-kit-demo.pages.dev
Branch Preview URL:	https://multi-signer-multi-sig.passkey-kit-demo.pages.dev

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