Josh

Initial implementation of JSON schema validation for publicJwk. Supports EC/secp256k1 and OKP/Ed25519 since that is what's currently supported for [verifying signatures](https://github.com/TBD54566975/dwn-sdk-js/blob/main/src/jose/algorithms/signing/index.ts)

Similar to the issue discovered in #23 . Make default tag list `None` and then assign `self.tags` an empty list if `None` demo of bug: ```python from nostr.event import Event...

- Add support for [nip56](https://github.com/nostr-protocol/nips/blob/master/56.md) - Address a couple mutable default args