fix(jwk): add validation for jwks

[atticusofsparta]

Ran into an issue across multiple apps that pull in the jwk and create an address with invalid jwk.n keys.

This validates the JWK by verifying the signature when signing transactions and when generating a wallet address. Should help prevent people accidentally sending tokens to their wallet when onboarding (as is what happend to me)

[rosmcmahon]

not going to merge this straight away.

• arweave-js needs a little TLC. even the automated tests are still running nodejs v16.
  • they don't pass with current LTS v20.
• the sign + validate for every createTransaction is kind of expensive
• there were some folks using valid 2048 length keys,
  • personally i think that should not have been allowed, but would have to check if that's still occurring in mined blocks
• perhaps we could add some other fast jwk validation steps?

[atticusofsparta]

Agreed, ideally the validateJWK implements checked based on the spec (byte length and regex check).