JWT Support

Nobody has claimed this yet.

There are feature requests in Jakarta Security around [JWT](https://github.com/jakartaee/security/issues/255), but as mentioned, the Jakarta-consuming [Microprofile JWT RBAC](https://github.com/eclipse/microprofile-jwt-auth) is not consumable by Jakarta Security or other specs at least on the API/Spec level.

Also while providing CDI wiring, MP JWT does not standardize decoding or encoding JWT similar to e.g. [Spring Security Oauth2 JWT](https://docs.spring.io/spring-security/site/docs/current/api/org/springframework/security/oauth2/jwt/package-summary.html) or
[JJWT](https://javadoc.io/doc/io.jsonwebtoken/jjwt-api/latest/index.html).

Beside that unlike Spring and others MP JWT also does not cover the [JOSE Header](https://www.rfc-editor.org/rfc/rfc7519#section-5) as of now.

Could:
- JsonWebToken (or Jwt)
- JwtDecoder (or JwtParser)
- JwtEncoder (or JwtGenerator/Builder)
- Claims
- Headers

be standardized here under a "jwt" package or module?

Start by reviewing the Jakarta Security and MicroProfile JWT issues linked in the description, then compare the cited Spring Security OAuth2 JWT and JJWT APIs. The work is complete when the scope and standardized JWT, decoder, encoder, claims, and header APIs are defined under the proposed Jakarta Security package or module.

Written by the indexing model from the issue text.