Solve the class lookup problem

[toth-istvan-zoltan]

The problem

1. The compiler plugin creates classes for adaptive functions.
2. The compiler exports the metadata of these classes only when they are generated by a FIR plugin.
3. Generation of top level declarations is faulty, therefore this FIR plugin is switched off.
4. The plugin cannot find the classes because they are not exported from FIR.

• [x] Check if this has been changed between 1.9.10 and 1.9.24 somehow
• [x] Check if this is still a problem for 2.0.0-RC3
• [x] Create a workaround

Possible workaround

Add an export holder manually to the codes. This is quite cumbersome but it would probably work:

@AdaptiveExports
object exports

Then the compiler plugin can add functions to this export which can in turn return with the actual fragment instance.

[toth-istvan-zoltan]

Confirmed that this is a compiler bug and wont' be fixed up until 2.1.0.

https://youtrack.jetbrains.com/issue/KT-58886

I'll go with the workaround.

[toth-istvan-zoltan]

The workaround to be implemented:

• [x] rework of the fragment implementation registry
• [x] create an AdaptiveFragmentCompanionCollector annotation
• [x] add companion to generated fragments, implementing AdaptiveFragmentCompanion
• [x] call addAll with all public fragment companions from the init of classes annotated with AdaptiveFragmentCompanionCollector
• [x] document these changes and also fragment visibility
• [x] check the bridge type handling of the factory, test with sandbox

[toth-istvan-zoltan]

Works in sandbox with JS (489df2e).