feat: disable debug logging in Rqlite MCP server to reduce disk writes

- Commented out debug logging statements in the Rqlite MCP server to prevent excessive disk writes during operation.
- Added a new PubSubAdapter method in the client for direct access to the pubsub.ClientAdapter, bypassing authentication checks for serverless functions.
- Integrated the pubsub adapter into the gateway for serverless function support.
- Implemented a new pubsub_publish host function in the serverless engine for publishing messages to topics.

pkg/serverless/mocks_test.go

@@ -136,6 +136,28 @@ func (m *MockHostServices) CacheDelete(ctx context.Context, key string) error {
 	return nil
 }
 
+func (m *MockHostServices) CacheIncr(ctx context.Context, key string) (int64, error) {
+	return m.CacheIncrBy(ctx, key, 1)
+}
+
+func (m *MockHostServices) CacheIncrBy(ctx context.Context, key string, delta int64) (int64, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	var currentValue int64
+	if val, ok := m.cache[key]; ok {
+		var err error
+		currentValue, err = parseInt64FromBytes(val)
+		if err != nil {
+			return 0, fmt.Errorf("value is not numeric")
+		}
+	}
+
+	newValue := currentValue + delta
+	m.cache[key] = []byte(fmt.Sprintf("%d", newValue))
+	return newValue, nil
+}
+
 func (m *MockHostServices) StoragePut(ctx context.Context, data []byte) (string, error) {
 	m.mu.Lock()
 	defer m.mu.Unlock()