JWKS support: Fetch, parse JWKS to Keys and encode Keys to JWKS. AWS ……Cognito JWKS with ease, one-liner: FetchAWSCognitoPublicKeys

minor: change GenerateBase64EdDSA: no padding

add GenerateBase64EdDSA helper

Merge pull request#17 from jamietanna/chore/go-versionDowngrade Go version requirement to 1.20

update to go1.21

breaking change: HeaderValidator: returns an extra output argument wh……ich can optionally (if not nil) set the decryption method dynamically based on the kid

add GenerateEdDSA helper and origin_jti on standard claims

minor: add optional MaxAge field to the multiple keys signer

add multiple key ids configuration and an example