[Mono] Enhance ILStrip to be capable of trimming away a single method

[fanyang-mono]

This work will help with IL stripping for MAUI Android and wasm apps.
Android app developers have requested this feature #44855

.NET8

• Enable AOT to print out the list of compiled methods ([Mono] Enable AOT to print out the list of compiled methods #81567)
• Add the capability of trimming IL code of individual methods ([Mono] Add the capability of trimming IL code of individual methods #86722)
• Android
  • Adopt this feature for Android apps ([Xamarin.Android.Build.Tasks] implement $(AndroidStripILAfterAOT) android#8172)
    • Android: new cil-strip feature causes app crashes #88538
  • [Mono] Investigate the issue with trimming Mono.Android.dll #90403
  • [mono] Add telemetry for AndroidStripILAfterAOT #90950
  • Add a release note (What's new in .NET 8 RC 1 [WIP] core#8439)
    • Will be included in .NET8 Performance Improvements in .NET MAUI blog post by @jonathanpeppers (https://github.com/microsoft/dotnet-blog/pull/1279)
• WASM
  • Adopt this feature for wasm apps ([WASM] Enable new IL trim feature for WASM apps #88696)
  • [WASM] Add telemetry to track the use of WasmStripILAfterAOT #90671
  • Add a release note (What's new in .NET 8 RC 1 [WIP] core#8439 (comment))
    • Daniel will add it to ASP.NET Core blog post as well.

.NET9

• [Mono] Add the functionality to analyze the size of all compiled methods #90232
• [Mono] Enable more WASM AOT tests to run with WASMStripIL=true #90233
• [Mono] Fix all the issues related to enabling WasmStripILAfterAOT #90436
• [wasm] Enable WasmStripILAfterAOT by default #94682
• [Mono] Give ILStrip a namespace #89608

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[SamMonoRT]

Moving tracking issue to 9.0.0 - some items may still be completed by .NET8 release.
@fanyang-mono - The description should separate out work completed in 8.0 v/s Future/9.0 work.

[fanyang-mono]

StripAssembly currently relies on Cecil. We would like to upgrade it with modern API's. However, we are blocked by lacking API support for editing existing assemblies. See #30443 for details.