public CompletableFuture<Boolean> revokeAccessToken(String accessToken) {
        final ClientAuthentication clientAuthentication = clientAuthentication();
        final TokenOperationRequest tokenOperationRequest =
                TokenOperationRequest.of(clientAuthentication, accessToken, REFRESH_TOKEN);
        return revocationEndpoint.execute(tokenOperationRequest);
    }
Implements Token Revocation request/response flow,
as per <a href="https://datatracker.ietf.org/doc/html/rfc7009#section-2">[RFC7009], Section 2</a>.
oauth2/src/main/java/com/linecorp/armeria/common/auth/oauth2/TokenRevocation.java