.NET MAUI: Performance Profiling

[jonathanpeppers]

This is still WIP.

I'm wanting to consolidate the following pages into a single MS Learn doc:

• https://github.com/dotnet/maui/wiki/Profiling-.NET-MAUI-Apps
• https://github.com/dotnet/maui/wiki/Memory-Leaks
• https://github.com/dotnet/android/blob/main/Documentation/guides/tracing.md
• https://github.com/dotnet/macios/wiki/Profiling
• https://github.com/dotnet/macios/wiki/Profiling-App-Launch
• https://github.com/jonathanpeppers/measure-startup
• https://github.com/jonathanpeppers/maui-profiling?#faq

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