refactor(Webpack): more reliable patching

[Nuckyz]

I honestly recommend reviewing this by just looking at files changed and looking at the new file, lots of small changes and stuff like just indentation

• Rework how webpack require is grabbed:

  • Instead of trying to push a fake module to webpackChunkdiscord_app everytime its value is defined again, it now monkey patches the init callback Discord runs to initialize the app after all needed chunks are loaded

  • This lets us more reliably get the webpack require as soon as we can, but of course not too soon in a point where needed properties would not be yet defined. It also makes it impossible for us to grab the sentry webpack require instead of the main, in case sentry somehow loaded faster than the main webpack script.

• Add beforeWebpackInit API:
  • By monkey patching the init callback we can also run our own code before the app is intialized. This is specifically used by the code used to grab the require and by the reporter to start searching for chunks and loading them.
• Add factoryListeners API:
  • Also only used by the reporter for now, but allows a callback to run everytime a new module factory is added to the modules array.
• Future proof and fix issues/potential isseus with extractAndLoadChunks & reporter:

  • Makes extractAndLoadChunks and the reporter not rely on the chunk group id being the also the entry point id.

  • extractAndLoadChunks now grabs the chunk group id and entry point as two separate capturing groups. I also fixed logic issues with it, which I didn't notice before.

  • Reporter no longer depends on the chunk group id being the entry point when looking at the chunks object to load chunks. Now it manually scrapes chunks loaded from every module factory using regex, to grab the chunk group id and the entry point, until every chunk loaded by Discord is manually loaded by us. After that it manually loads the rest of the chunks which Discord is not using, so we can be aware of duplicate modules too.

• Cleanup Webpack patching for more readable code.