Add cloud field to HostMetadata

Port of Go SDK #1512. Adds a `cloud` field (String, `@JsonProperty("cloud")`)
to the HostMetadata class, with getter and updated constructor. Includes
deserialization and constructor tests.

Co-authored-by: Isaac

Author: hectorcast-db

databricks-sdk-java/src/main/java/com/databricks/sdk/core/oauth/HostMetadata.java

@@ -20,6 +20,9 @@ public class HostMetadata {
   @JsonProperty("workspace_id")
   private String workspaceId;
 
+  @JsonProperty("cloud")
+  private String cloud;
+
   public HostMetadata() {}
 
   public HostMetadata(String oidcEndpoint, String accountId, String workspaceId) {
@@ -28,6 +31,13 @@ public HostMetadata(String oidcEndpoint, String accountId, String workspaceId) {
     this.workspaceId = workspaceId;
   }
 
+  public HostMetadata(String oidcEndpoint, String accountId, String workspaceId, String cloud) {
+    this.oidcEndpoint = oidcEndpoint;
+    this.accountId = accountId;
+    this.workspaceId = workspaceId;
+    this.cloud = cloud;
+  }
+
   public String getOidcEndpoint() {
     return oidcEndpoint;
   }
@@ -39,4 +49,8 @@ public String getAccountId() {
   public String getWorkspaceId() {
     return workspaceId;
   }
+
+  public String getCloud() {
+    return cloud;
+  }
 }

databricks-sdk-java/src/test/java/com/databricks/sdk/core/oauth/HostMetadataTest.java

@@ -0,0 +1,62 @@
+package com.databricks.sdk.core.oauth;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+
+class HostMetadataTest {
+
+  private final ObjectMapper mapper = new ObjectMapper();
+
+  @Test
+  void testDeserializeWithCloud() throws Exception {
+    String json =
+        "{\"oidc_endpoint\":\"https://example.com/oidc\","
+            + "\"account_id\":\"acc-123\","
+            + "\"workspace_id\":\"ws-456\","
+            + "\"cloud\":\"aws\"}";
+
+    HostMetadata meta = mapper.readValue(json, HostMetadata.class);
+
+    assertEquals("https://example.com/oidc", meta.getOidcEndpoint());
+    assertEquals("acc-123", meta.getAccountId());
+    assertEquals("ws-456", meta.getWorkspaceId());
+    assertEquals("aws", meta.getCloud());
+  }
+
+  @Test
+  void testDeserializeWithoutCloud() throws Exception {
+    String json =
+        "{\"oidc_endpoint\":\"https://example.com/oidc\","
+            + "\"account_id\":\"acc-123\","
+            + "\"workspace_id\":\"ws-456\"}";
+
+    HostMetadata meta = mapper.readValue(json, HostMetadata.class);
+
+    assertEquals("https://example.com/oidc", meta.getOidcEndpoint());
+    assertEquals("acc-123", meta.getAccountId());
+    assertEquals("ws-456", meta.getWorkspaceId());
+    assertNull(meta.getCloud());
+  }
+
+  @Test
+  void testConstructorWithCloud() {
+    HostMetadata meta = new HostMetadata("https://example.com/oidc", "acc-123", "ws-456", "gcp");
+
+    assertEquals("https://example.com/oidc", meta.getOidcEndpoint());
+    assertEquals("acc-123", meta.getAccountId());
+    assertEquals("ws-456", meta.getWorkspaceId());
+    assertEquals("gcp", meta.getCloud());
+  }
+
+  @Test
+  void testConstructorWithoutCloud() {
+    HostMetadata meta = new HostMetadata("https://example.com/oidc", "acc-123", "ws-456");
+
+    assertEquals("https://example.com/oidc", meta.getOidcEndpoint());
+    assertEquals("acc-123", meta.getAccountId());
+    assertEquals("ws-456", meta.getWorkspaceId());
+    assertNull(meta.getCloud());
+  }
+}