feat: Support Delete Message API (#799)

* feat: Add DeleteMessage function to API client

* fix: linter

nolint : Deprecated method
split function: cognitive complexity 21

* rename func name for unit-test

messages.go

@@ -73,6 +73,14 @@ type MessageFilesList struct {
 	httpHeader
 }
 
+type MessageDeletionStatus struct {
+	ID      string `json:"id"`
+	Object  string `json:"object"`
+	Deleted bool   `json:"deleted"`
+
+	httpHeader
+}
+
 // CreateMessage creates a new message.
 func (c *Client) CreateMessage(ctx context.Context, threadID string, request MessageRequest) (msg Message, err error) {
 	urlSuffix := fmt.Sprintf("/threads/%s/%s", threadID, messagesSuffix)
@@ -186,3 +194,19 @@ func (c *Client) ListMessageFiles(
 	err = c.sendRequest(req, &files)
 	return
 }
+
+// DeleteMessage deletes a message..
+func (c *Client) DeleteMessage(
+	ctx context.Context,
+	threadID, messageID string,
+) (status MessageDeletionStatus, err error) {
+	urlSuffix := fmt.Sprintf("/threads/%s/%s/%s", threadID, messagesSuffix, messageID)
+	req, err := c.newRequest(ctx, http.MethodDelete, c.fullURL(urlSuffix),
+		withBetaAssistantVersion(c.config.AssistantVersion))
+	if err != nil {
+		return
+	}
+
+	err = c.sendRequest(req, &status)
+	return
+}