[Mono] Add the capability of trimming IL code of individual methods (#86722)

[Mono] Add the capability of trimming IL code of individual methods (#86722)

* Add the capability of trimming individual methods

* Fix build errors

* Remove printf's

* Add the option to use compiled-methods-outfile

* Avoid trimming shared methods when they are still in use

* Add parameter description

* Add the option to trim compiled methods

* Address review feedback

* Add metadata MethodTokenFile to CompiledAssemblies

* Add GUID checks and use metadata of assemblies

* Create smaller functions and use hex value

* Update src/tasks/AotCompilerTask/MonoAOTCompiler.cs

Co-authored-by: Ankit Jain <radical@gmail.com>
* Move parameter validation code

* Update src/tasks/MonoTargetsTasks/ILStrip/ILStrip.cs

Co-authored-by: Ankit Jain <radical@gmail.com>
* Update src/tasks/MonoTargetsTasks/ILStrip/ILStrip.cs

Co-authored-by: Ankit Jain <radical@gmail.com>
* Update src/tasks/MonoTargetsTasks/ILStrip/ILStrip.cs

Co-authored-by: Ankit Jain <radical@gmail.com>
* Update src/tasks/MonoTargetsTasks/ILStrip/ILStrip.cs

Co-authored-by: Ankit Jain <radical@gmail.com>
* Update src/tasks/MonoTargetsTasks/ILStrip/ILStrip.cs

Co-authored-by: Ankit Jain <radical@gmail.com>
* Update src/tasks/MonoTargetsTasks/ILStrip/ILStrip.cs

Co-authored-by: Ankit Jain <radical@gmail.com>
* Update src/tasks/MonoTargetsTasks/ILStrip/ILStrip.cs

Co-authored-by: Ankit Jain <radical@gmail.com>
* Update src/tasks/MonoTargetsTasks/ILStrip/ILStrip.cs

Co-authored-by: Ankit Jain <radical@gmail.com>
* Add more error handling

* Provide a list of trimmed assemblies as output

* Update src/tasks/MonoTargetsTasks/ILStrip/ILStrip.cs

Co-authored-by: Ankit Jain <radical@gmail.com>
* Address coding style feedbacks

* Fix var anmes

* Delete trimmed assemblies after copy

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Co-authored-by: Ankit Jain <radical@gmail.com>