feat: add display.render_mode to control DataFrame/Series visualization

bigframes/display/html.py

@@ -361,7 +361,7 @@ def repr_mimebundle(
     if opts.repr_mode == "deferred":
         return repr_mimebundle_deferred(obj)
 
-    if opts.repr_mode == "anywidget":
+    if opts.render_mode == "anywidget" or opts.repr_mode == "anywidget":
         try:
             with bigframes.option_context("display.progress_bar", None):
                 with warnings.catch_warnings():
@@ -380,4 +380,8 @@ def repr_mimebundle(
                 f"Falling back to static HTML. Error: {traceback.format_exc()}"
             )
 
-    return repr_mimebundle_head(obj)
+    bundle = repr_mimebundle_head(obj)
+    if opts.render_mode == "plaintext":
+        bundle.pop("text/html", None)
+
+    return bundle