feat: ✨ gcp support implementation

Author: harshithad0703

src/main/java/com/contentstack/sdk/Config.java

@@ -196,7 +196,7 @@ public Config setManagementToken(@NotNull String managementToken) {
      * The enum Contentstack region. for now contentstack supports [US, EU, AZURE_NA]
      */
     public enum ContentstackRegion {
-        US, EU, AZURE_NA, AZURE_EU
+        US, EU, AZURE_NA, AZURE_EU, GCP_NA
     }
 
 }

src/main/java/com/contentstack/sdk/Stack.java

@@ -63,6 +63,11 @@ protected void setConfig(Config config) {
                     urlDomain = "cdn.contentstack.com";
                 }
                 config.host = "azure-eu" + "-" + urlDomain;
+            } else if (region.equalsIgnoreCase("gcp_na")) {
+                if (urlDomain.equalsIgnoreCase("cdn.contentstack.io")) {
+                    urlDomain = "cdn.contentstack.com";
+                }
+                config.host = "gcp-na" + "-" + urlDomain;
             }
         }
 

src/test/java/com/contentstack/sdk/TestGcpRegion.java

@@ -0,0 +1,36 @@
+package com.contentstack.sdk;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class TestGcpRegion {
+    @Test
+    void testGcpRegionBehaviourGcpNA() {
+        Config config = new Config();
+        Config.ContentstackRegion region = Config.ContentstackRegion.GCP_NA;
+        config.setRegion(region);
+        Assertions.assertFalse(config.region.name().isEmpty());
+        Assertions.assertEquals("GCP_NA", config.region.name());
+    }
+
+    @Test
+    void testGcpNaRegionBehaviourGcpStack() throws IllegalAccessException {
+        Config config = new Config();
+        Config.ContentstackRegion region = Config.ContentstackRegion.GCP_NA;
+        config.setRegion(region);
+        Stack stack = Contentstack.stack("fakeApiKey", "fakeDeliveryToken", "fakeEnvironment", config);
+        Assertions.assertFalse(config.region.name().isEmpty());
+        Assertions.assertEquals("GCP_NA", stack.config.region.name());
+    }
+
+    @Test
+    void testGcpNARegionBehaviourGcpStackHost() throws IllegalAccessException {
+        Config config = new Config();
+        Config.ContentstackRegion region = Config.ContentstackRegion.GCP_NA;
+        config.setRegion(region);
+        Stack stack = Contentstack.stack("fakeApiKey", "fakeDeliveryToken", "fakeEnvironment", config);
+        Assertions.assertFalse(config.region.name().isEmpty());
+        Assertions.assertEquals("gcp-na-cdn.contentstack.com", stack.config.host);
+
+    }
+}