WIP migrate away from BindingModuleGenerator

[ZacSweers]

Ref: #751

Current status

• Reimplemented ContributesBinding code gen to generate these dagger modules directly

TODO

• [ ] Updated tests
• [ ] Update component merging to no longer look for binding hints?
• [ ] Delete BindingModuleGenerator
• [ ] Integrate BindingPriority into component merging
• [ ] Does renameDuplicateFunctions() still have a place?

[ZacSweers]

Superseded by #877