Add TypographicFamilyName to GlyphTypeface and use it for FontCollection

[Gillibald]

What does the pull request do?

Font files have a primary family name which might include some typeface name (like "Light" or "Bold") as we can see in the XAML below. In addition to that there is a typographic family name which groups all these fonts so then can be resolved with the primary name (in the XAML below that is "Manrope").

This PR adds TypographicFamilyName to the IGlyphTypeface2 interface and uses it in the FontCollection implementations to load fonts via their TypographicFamilyName instead of the regular FamilyName which might include the weight name.

Using this PR users can write e.g, "Manrope" and the font manager will resolve the family name. Previously the font manager wasn't aware of the typographic family name and therefore wasn't able to resolve the expected typeface.

See #16607 for further information about the spec.

What is the current behavior?

What is the updated/expected behavior with this PR?

<StackPanel>
       <TextBlock FontFamily="/#Manrope" Text="Manrope Light" FontWeight="Light"/>
       <TextBlock FontFamily="/#Manrope" Text="Manrope" FontWeight="Normal"/>
       <TextBlock FontFamily="/#Manrope" Text="Manrope Medium" FontWeight="Medium"/>
       <TextBlock FontFamily="/#Manrope" Text="Manrope SemiBold" FontWeight="SemiBold"/>
       <TextBlock FontFamily="/#Manrope" Text="Manrope Bold" FontWeight="Bold"/>
</StackPanel>

How was the solution implemented (if it's not obvious)?

Checklist

• Added unit tests (if possible)?
• Added XML documentation to any related classes?
• Consider submitting a PR to https://github.com/AvaloniaUI/avalonia-docs with user documentation

Breaking changes

Obsoletions / Deprecations

Fixed issues

Fixes: #16607

[avaloniaui-bot]

You can test this PR using the following package version. 11.2.999-cibuild0051531-alpha. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]