New Architecture: support custom .ttf fontFamily

[JakobKrummeichAndrena]

Summary

Support custom .ttf fonts as fontFamily parameter for <Text> and <TextInput>

Motivation

In the old architecture for react native windows it is possible to use .ttf fonts as fontFamily parameter to render custom fonts. However, this is not yet supported by the new architecture. See this issue for more information.

Basic Example

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Open Questions

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