feat: refactor database dialect handling and add stubs for unsupported features

parsers/js/js_stub.go

@@ -0,0 +1,16 @@
+//go:build no_jsparser
+
+package js
+
+import (
+	"context"
+	"errors"
+)
+
+func LoadPlugins(ctx context.Context, dir string) error {
+	return errors.New("JS parser plugins are not supported in this build")
+}
+
+func AddPlugin(ctx context.Context, code string, name string) error {
+	return errors.New("JS parser plugins are not supported in this build")
+}