As per [spec](https://github.com/serverlessworkflow/specification/blob/main/dsl-reference.md#oauth2-authentication), we are supporting `ClientSecretBasic` and `ClientSecretPost` authentication, but we are lacking `PrivateKeyJwt` and `ClientSecretJwt`. The relevant code to completed is located [here](https://github.com/serverlessworkflow/sdk-java/blob/main/impl/http/src/main/java/io/serverlessworkflow/impl/executors/http/auth/requestbuilder/AbstractAuthRequestBuilder.java#L87-L90) and [here](https://github.com/serverlessworkflow/sdk-java/blob/main/impl/http/src/main/java/io/serverlessworkflow/impl/executors/http/auth/requestbuilder/AbstractAuthRequestBuilder.java#L112-L116) Also we are not considering following fields: - actors - subject - [endpoints.revocation](https://github.com/serverlessworkflow/sdk-java/blob/main/impl/http/src/main/java/io/serverlessworkflow/impl/executors/http/auth/requestbuilder/OAuthRequestBuilder.java#L39) - [endpoints.introspection](https://github.com/serverlessworkflow/sdk-java/blob/main/impl/http/src/main/java/io/serverlessworkflow/impl/executors/http/auth/requestbuilder/OAuthRequestBuilder.java#L40)