[GH-473] Port Font to Editor

[pictos]

Description of Change

Implements #473

Additions made

• Adds Font property map to EditorHandler
• Adds Font mapping methods to EditorHandlerfor Android and iOS
• Adds extension methods to apply Font on Android/iOS
• Adds DeviceTests for initial Font values on iOS and Android

PR Checklist

• Targets the correct branch
• Tests are passing (or failures are unrelated)
• Targets a single property for a single control (or intertwined few properties)
• Adds the property to the appropriate interface
• Avoids any changes not essential to the handler property
• Adds the mapping to the PropertyMapper in the handler
• Adds the mapping method to the Android, iOS, and Standard aspects of the handler
• Implements the actual property updates (usually in extension methods in the Platform section of Core)
• Tags ported renderer methods with [PortHandler]
• Adds an example of the property to the sample project (MainPage)
• Adds the property to the stub class
• Implements basic property tests in DeviceTests

[mattleibow]

Looks almost perfect but maybe also add the tests from Entry that also check the font size and attributes? Namely the FontSizeInitializesCorrectly and FontAttributesInitializeCorrectly tests.

Otherwise this is nice and clean and seems to have all the things.

Thanks!

[mattleibow]

Also, could you add the entry to the sample MainPage. I know this is now almost impossible to test at this point, but once we got some navigation going this will all be much better.

[pictos]

@mattleibow when you say Entry you mean Editor right?

[mattleibow]

I mean copy the 2 tests from entry to editor

[pictos]

@mattleibow I see, but when you talk about the MainPage.cs sample, is to add the Editor instead of the entry, right? (Yeah it's a dumb question from me, but just to make sure)

[mattleibow]

Ah yeah. Editor. 🤦🏻‍♀️ So menu words looking the same.

[jsuarezruiz]

Not related with this PR, but we have this message repeated in several places. Maybe we can create some specific exceptions like FontInitializationException or group all the messages etc.

[jsuarezruiz]

Thanks @pictos. Looks nice, just some small changes and I think is ready.