jwt: implement jwt normalize claims (#30579)

Commit Message: Implements space delimited claims from #30356
Additional Description: none
Risk Level: low
Testing: added
Docs Changes: none
Release Notes: none
Signed-off-by: Kuat Yessenov <kuat@google.com>

Mirrored from https://github.com/envoyproxy/envoy @ f3a3d64509649a873c6471a3ec7a03e08acc3c3e

envoy/extensions/filters/http/jwt_authn/v3/config.proto

@@ -242,7 +242,6 @@ message JwtProvider {
   //
   string payload_in_metadata = 9;
 
-  // [#not-implemented-hide:]
   // Normalizes the payload representation in the request metadata.
   NormalizePayload normalize_payload_in_metadata = 18;