Deprecating monkey-patching internal objects?

[Ginden]

Is your feature request related to a problem? Please describe.
This is question and discussion regarding design decisions around symbols. Relevant docs document

Local symbols make it harder for developers to monkey patch/access private fields, as they require more work than a property prefixed with an _. Monkey patching private API that were not designed to be monkey-patchable make maintaining and evolving Node.js harder, as private properties are not documented and can change within a patch release. Some extremely popular modules in the ecosystem monkey patch some internals, making it impossible for us to update and improve those areas without causing issues for a significant amount of users.

Describe the solution you'd like
I would like to remove all internals monkey-patching in foreseeable future. This would fix #22498

Therefore, I would propose:

• Move all internal properties to symbols or private fields.
• Expose getters/setters under current names, emit deprecation warning about monkey-patching internals.
• Identify use cases of these libraries and provide alternative way to do these things
• Remove getters/setters over time

This is probably work for at least 2 LTS releases to allow libraries to adopt. It's obviously semver-major.

Describe alternatives you've considered

Make _hiddenProperty non-enumerable (proposed by @refack in #22498).