Feat!: Remove prototype access to instance interfaces

[DiamondMofeng]

In the javascript world, prototype can only be accessed from constructors. Adding prototype to these interfaces is invalid and wrong

Anyway, this may break something. Please merge this PR only if we are about to release a major update.

Checklists

• Test passed
• Coding style (indentation, etc)
• Edits have been made to src/ files not index.d.ts
• Run npm run compile to update index.d.ts

[tiennou]

For the record, not seeing any breakage from that here, and that's ~120 prototyped functions.