[APIView] feature to highlight handwritten/patched code

[swathipil]

This would help us see whether changes need to be made to the emitters, the spec, or the patched code.

Options for vizualization:

• Diagnostic bannner that says "patched" or something similar
• Something that could be toggled on and would highlight the handwritten code in a color

[praveenkuttappan]

@swathipil How do you identify patched or handwritten code? Is this something Python API parser can identify and set a flag?

It is possible that you can add a new style class name for handwritten code and UI can have different css to highlight them. @chidozieononiwu Please correct me if I am wrong.

We can also definitely add a new toggler in UI to find or highlight them.

[swathipil]

In Python, handwritten code is added to a _patch file so it's something that we can identify.