feat: Add Universe Domain to ClientSettings (#2331)

* feat: Add Universe Domain to ClientSettings * chore: Revert adding builder's getters * chore: Udpate tests for ClientSettingsTest

Author: lqiu96

gax-java/gax/src/main/java/com/google/api/gax/rpc/ClientSettings.java

@@ -93,6 +93,10 @@ public final ApiClock getClock() {
  return stubSettings.getClock();
  }
 
+ public final String getUniverseDomain() {
+ return stubSettings.getUniverseDomain();
+ }
+
  public final String getEndpoint() {
  return stubSettings.getEndpoint();
  }
@@ -125,6 +129,7 @@ public String toString() {
  .add("headerProvider", getHeaderProvider())
  .add("internalHeaderProvider", getInternalHeaderProvider())
  .add("clock", getClock())
+ .add("universeDomain", getUniverseDomain())
  .add("endpoint", getEndpoint())
  .add("quotaProjectId", getQuotaProjectId())
  .add("watchdogProvider", getWatchdogProvider())
@@ -241,6 +246,12 @@ public B setClock(ApiClock clock) {
  return self();
  }
 
+ /** Sets the Universe Domain to configure the resolved endpoint */
+ public B setUniverseDomain(String universeDomain) {
+ stubSettings.setUniverseDomain(universeDomain);
+ return self();
+ }
+
  public B setEndpoint(String endpoint) {
  stubSettings.setEndpoint(endpoint);
  return self();