Release 0.3.0 Checklist

[jgrandja]

Upgrade to Spring Security 5.6+

• Remove JoseHeader, JoseHeaderNames, JwtClaimsSet, JwtEncoder, JwtEncodingException, NimbusJwsEncoder -- Remove JwtEncoder and associated classes #724
• Remove OAuth2TokenIntrospectionClaimAccessor, OAuth2TokenIntrospectionClaimNames -- Remove OAuth2TokenIntrospectionClaimAccessor #725
• Remove OAuth2AccessTokenResponseHttpMessageConverter -- Remove temporary OAuth2AccessTokenResponseHttpMessageConverter #726
• Use OAuth2ErrorCodes.INVALID_REDIRECT_URI -- Use OAuth2ErrorCodes.INVALID_REDIRECT_URI #727

Miscellaneous

• Move OAuth2TokenContext, OAuth2TokenCustomizer, JwtEncodingContext and JwtEncodingContextTests to package org.springframework.security.oauth2.server.authorization.token -- Move OAuth2TokenCustomizer to token package #730
• Change interface to final class - OidcClientMetadataClaimNames, OidcProviderMetadataClaimNames, OAuth2AuthorizationServerMetadataClaimNames -- Change interface that only contain constants to final class #728
• Update samples to use Spring Boot 2.6+ -- Update to Spring Boot 2.6.7 #719
• Remove @Deprecated markers -- Remove deprecations #732