[Enhancement] Improve TypeScript Types

[jonobr1]

Is your feature request related to a problem? Please describe.
Improve the TypeScript Types definitions of Two.js by:

1. Moving namespaces -> interfaces
2. Add fromObject, copy, clone, toObject to all applicable classes
3. Improve hinting by putting in constant values. E.g: all static Properties lists should be the actual values.

Additional context
This is in the lead-up and concurrent to developing / releasing @react-two library to make Two.js a declarative React compatible component.

[jonobr1]

Tracking here: https://github.com/jonobr1/two.js/tree/types-improvement

[jonobr1]

Up to line 2931: https://github.com/jonobr1/two.js/blob/types-improvement/types.d.ts#L2941