Move App Inventor specific objects out of Blockly namespace

[ewpatton]

Once the Blockly v10 migration is done, we should make an effort to move any App Inventor specific features that aren't monkeypatches out of the Blockly namespace. This will make future updates easier and reduce the chances of name collisions between the projects.

[ewpatton]

Previously, @mark-friedman noted that mutators.js has a number of these.

[YashSachdeva369]

I completely agree with the idea of separating App Inventor-specific features from the Blockly namespace to improve maintainability. I'd be interested in contributing to this effort, especially in isolating any non-monkeypatch-related features. Could you guide me on the files or areas of code that need this work, especially regarding mutators.js or other relevant files?