@Deprecated
    public static OAuth2ResourceOwnerPasswordCredentialsGrantBuilder builder(WebClient accessTokenEndpoint,
                                                                             String accessTokenEndpointPath) {
        return new OAuth2ResourceOwnerPasswordCredentialsGrantBuilder(accessTokenEndpoint,
                                                                      accessTokenEndpointPath);
    }
Creates a new builder for {@link OAuth2ResourceOwnerPasswordCredentialsGrant}.
@param accessTokenEndpoint A {@link WebClient} to facilitate an Access Token request. Must correspond to
                           the Access Token endpoint of the OAuth 2 system.
@param accessTokenEndpointPath A URI path that corresponds to the Access Token endpoint of the

@deprecated Use {@link OAuth2AuthorizationGrant#builder(WebClient, String)} with
            {@link AccessTokenRequest#ofResourceOwnerPassword(String, String)} instead.
oauth2/src/main/java/com/linecorp/armeria/client/auth/oauth2/OAuth2ResourceOwnerPasswordCredentialsGrant.java