[Managed DWrite] Migrate FontFileEnumerator to managed #10523
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Contributes to #5305
Description
Migrate DWrite FontFileEnumerator to managed.
Customer Impact
It might be faster and should allow better support of trimming and the support of NativeAOT once everything is migrated to C#.
Regression
No.
Testing
Local build + CI + I tested a few apps that uses custom fonts to test this code path.
Risk
Low. For the most part, it is a copy of the C++ code manually rewritten to C# with as little changes as possible.
Microsoft Reviewers: Open in CodeFlow