Add support for multiple types in Chroma metadata

- Change Chroma collection metadata to Map<String, Object>
- Allows integer and other value types to be passed in

Fixes #1548

Author: CodingNowPls

vector-stores/spring-ai-chroma-store/src/main/java/org/springframework/ai/chroma/ChromaApi.java

@@ -106,7 +106,7 @@ public ChromaApi withBasicAuthCredentials(String username, String password) {
 	 * @param name The name of the collection.
 	 * @param metadata Metadata associated with the collection.
 	 */
-	public record Collection(String id, String name, Map<String, String> metadata) {
+	public record Collection(String id, String name, Map<String, Object> metadata) {
 	}
 
 	/**
@@ -115,7 +115,7 @@ public record Collection(String id, String name, Map<String, String> metadata) {
 	 * @param name The name of the collection to create.
 	 * @param metadata Optional metadata to associate with the collection.
 	 */
-	public record CreateCollectionRequest(String name, Map<String, String> metadata) {
+	public record CreateCollectionRequest(String name, Map<String, Object> metadata) {
 		public CreateCollectionRequest(String name) {
 			this(name, new HashMap<>(Map.of("hnsw:space", "cosine")));
 		}

vector-stores/spring-ai-chroma-store/src/test/java/org/springframework/ai/chroma/ChromaApiIT.java

@@ -55,6 +55,14 @@ public void beforeEach() {
 		chroma.listCollections().stream().forEach(c -> chroma.deleteCollection(c.name()));
 	}
 
+	@Test
+	public void testClientWithMetadata() {
+		Map<String, Object> metadata = Map.of("hnsw:space", "cosine", "hnsw:M", 5);
+		var newCollection = chroma.createCollection(new ChromaApi.CreateCollectionRequest("TestCollection", metadata));
+		assertThat(newCollection).isNotNull();
+		assertThat(newCollection.name()).isEqualTo("TestCollection");
+	}
+
 	@Test
 	public void testClient() {
 		var newCollection = chroma.createCollection(new ChromaApi.CreateCollectionRequest("TestCollection"));