Addressing review comments

Author: Divya

sdk-core/src/main/java/io/milvus/v2/client/ConnectConfig.java

@@ -48,6 +48,7 @@ public class ConnectConfig {
     private String proxyAddress;
     private Boolean secure = false;
     private long idleTimeoutMs = TimeUnit.MILLISECONDS.convert(24, TimeUnit.HOURS);
+    private boolean enablePrecheck = false;  // default value is false
 
     private SSLContext sslContext;
     // clientRequestId maintains a map for different threads, each thread can assign a specific id.

sdk-core/src/main/java/io/milvus/v2/client/MilvusClientV2.java

@@ -132,9 +132,11 @@ private void initServices(String dbName) {
      */
     private void connect(ConnectConfig connectConfig) {
         this.connectConfig = connectConfig;
-        validateHostname(connectConfig);
-        validatePort(connectConfig);
-        validateCert(connectConfig);
+        if (connectConfig.isEnablePrecheck()) {
+            validateHostname(connectConfig);
+            validatePort(connectConfig);
+            validateCert(connectConfig);
+        }    
         try {
             if (this.channel != null) {
                 // close channel first
@@ -288,7 +290,7 @@ public void validatePort(ConnectConfig connectConfig) {
             throw new MilvusClientException(ErrorCode.RPC_ERROR, message);
         }
     }
-    
+
     /**
      * Validates SSL connection with certificates.
      *