feat: Styling of labels in FAB.Group

[haakandev]

Summary

This PR adds properties for the FAB.Group actions to allow for custom styling of the FAB.Group labels.

Test plan

Provide labelTextColor and labelStyle properties in the FAB.Group's actions array.

[callstack-bot]

Hey @haakandev, thank you for your pull request 🤗. The documentation from this branch can be viewed here.

[andreialecu]

I recently ended up using patch-package to add this and I was just about to open pretty much the exact same PR.

Please consider merging this.

[hefberk]

property fontSize doesn't seems working

[haakandev]

property fontSize doesn't seems working

Hi @hefberk - the label component as is just uses a standard react-native-paper Text element. The labelStyle is actually for the wrapping View component. If desired, the change could be modified to take a labelTextStyle prop instead of labelTextColor to allow further customising of the label text.

[lukewalczak]

@haakandev thanks!