Add fontStyle / fontName argument for FontAssetDelegate

[jhen0409]

In my case, using FontAssetDelegate to listen fetchFont(fontFamily) was not enough to know what font to load.

For example, I got fontFamily == "Roboto" but don't know the font style is Black. This PR will solve this problem.

[LottieSnapshotBot]

Snapshot Tests
28: Report Diff

[gpeal]

This would be a breaking change. To preserve backwards compatibility, the new methods should be added and then in FontAssetManager, we'll need to call the old one followed by the new one if the former returns null.

[LottieSnapshotBot]

Snapshot Tests
28: Report Diff

[gpeal]

Could you test https://github.com/airbnb/lottie-android/blob/master/snapshot-tests/src/main/assets/Tests/EmbeddedFont.zip? It looks like, from the snapshot tests, that the embedded font is no longer loading in this PR.

[jhen0409]

I did some testing on local. I have no permission to use that Happo / AWS S3 feature, so I replaced some s3 upload logic on debug.

• Currently I can't successfully render text, and the snapshot file size always 0 on local. Maybe have some guide for how to run snapshot-tests correctly?
• It seems does get it's own font (by Font.getTypeface()), no different with master.

[jhen0409]

Tested on sample (add EmbeddedFont.zip to assets). It seems works as expected (Pixel 6):