Modular Package Types

[baseten]

Depends on: #407
Easiest to review commit-by-commit

Converted modular codebase to Typescript 😅

There are still some improvements to be made:

• Take a second pass at the original manual types: https://github.com/pixijs/pixi-react/blob/v7.0.2/packages/react/index.d.ts
• Implement types for all DisplayObject props and extend current component props from those
• Why does ForwardRefExoticComponent for Stage lose the mount callback application type?
• Revisit usage of Container vs ExpandoContainer - sometimes we can probably just use Container
• Fix circular dependency of BaseStage and StageType in components
• Should component prop type definitions live in component file, or components/types.ts or react-types module
• Can we pull eventHandlers definition from FederatedEventEmitterTypes
• Improve DisplayObjectSettableProperties
• Does Expando stuff break inheritance chain or not?
• Double check appendChild/removeChild double events?
• Consider providing different generic types for instance and parent for didMount and willUnmount types

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