[mono] Add support for library mode in the aot compiler

[steveisok]

As a native developer targeting Android, iOS, or wasm, I would like to use a shared library containing custom managed code plus the mono runtime so that I can call into managed functions from my native application. The library should take the same approach as NativeAOT, only exporting the symbols from managed functions decorated with [UnmanagedCallersOnly(EntryPoint = "")].

• Run basic functional test loading two libraries in the same app (iOS & Android)
• Modify aot compiler to generate exports file with symbols for all [UnmanagedCallersOnly(EntryPoint = "")]
  [mono] Export unmanagedcallersonly method symbols #79424 ✅
• Create a library builder msbuild task that produces a cmake file to build / link the library
  [android][ios] Add LibraryBuilder task to support aot library mode #81919 ✅
• Auto initialize and start the runtime when function is called from native code
  [Mono]: Add support for lazy runtime init in native-to-managed wrapper, similar to NativeAOT library build. #82253 ✅
  [tasks] Add auto runtime initialization template to LibraryBuilder #83050 ✅
• Extend direct-pinvoke support by accepting a list of functions & what static libraries to link
  [mono] Introduce designated direct pinvokes to mono aot compiler #79721 ✅
• Add workload so that customers can install and use the feature
• Bundle assets within the shared library to make it truly self-contained [mono][tasks] Extract EmitWasmBundle into generic EmitBundle task and enable bundling in mono self-contained library #84191
• Handle illink for library mode builds (preserve UnmanagedCallersOnly methods)
• Add functional test for library mode

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.

Tagging subscribers to 'arch-android': @steveisok, @akoeplinger
See info in area-owners.md if you want to be subscribed.

Issue Details

---

As a native developer targeting Android, iOS, or wasm, I would like to use a shared library containing custom managed code plus the mono runtime so that I can call into managed functions from my native application. The library should take the same approach as NativeAOT, only exporting the symbols from managed functions decorated with [UnmanagedCallersOnly(EntryPoint = "")].

• Run basic functional test loading two libraries in the same app (iOS & Android)
• Modify aot compiler to generate exports file with symbols for all [UnmanagedCallersOnly(EntryPoint = "")]
• Create a library builder msbuild task that produces a cmake file to build / link the library
• Auto initialize and start the runtime when function is called from native code
• Extend direct-pinvoke support by accepting an list of functions & what static libraries to link
• Add workload to make it easier to install the mobile runtime packs + tooling
• Add functional test for library mode

Author:	steveisok
Assignees:	-
Labels:	os-android, User Story
Milestone:	8.0.0

Tagging subscribers to 'arch-wasm': @lewing
See info in area-owners.md if you want to be subscribed.

Issue Details

---

As a native developer targeting Android, iOS, or wasm, I would like to use a shared library containing custom managed code plus the mono runtime so that I can call into managed functions from my native application. The library should take the same approach as NativeAOT, only exporting the symbols from managed functions decorated with [UnmanagedCallersOnly(EntryPoint = "")].

• Run basic functional test loading two libraries in the same app (iOS & Android)
• Modify aot compiler to generate exports file with symbols for all [UnmanagedCallersOnly(EntryPoint = "")]
• Create a library builder msbuild task that produces a cmake file to build / link the library
• Auto initialize and start the runtime when function is called from native code
• Extend direct-pinvoke support by accepting an list of functions & what static libraries to link
• Add workload to make it easier to install the mobile runtime packs + tooling
• Add functional test for library mode

Author:	steveisok
Assignees:	-
Labels:	arch-wasm, os-android, os-ios, User Story
Milestone:	8.0.0

[DeafMan1983]

Please do not forget to add includes and libraries if you use custom directories with includes and libraries for all platforms
Example:
ProjectRoot means your created class library's project

<IncludePath directory="{ProjectRoot}/include" />
<LibraryPath directory="{ProjectRoot}/libs" />

Like for custom object c / headers for adapters like USB Device supports or any device supporting.... or plugins with platform-engine desktop/shell managements or for WebAssembly with functions for current browser's runtime like Electron or Chromium etc...

PS: Please put support with AppImage for Linux if you don't worry to get warning like not found library for custom shared libraries.

<IsLinux>
 <SingleAppImage>true</SingleAppImage>
</IsLinux>

I hope you have to add more features in Net 8.0