Implements #4707 With .NET5 we are switching from XA linker implemented as msbuild task to ILLink tool with [custom steps](https://github.com/mono/linker/blob/master/docs/custom-steps.md) provided in an assembly. The new assembly with our custom steps is named `Microsoft.Android.Sdk.ILLink` and the source code is located in `src/Microsoft.Android.Sdk.ILLink`. It is used during build by `ILLink` tool. The initial support is already able to link and run simple XA and XA/XF samples. Future work * replace reflection usage in SetupStep #4709 * audit reflection usage in our code #4708 * add more customs steps - we are still missing MonoDroidMarkStep Notes * the Profile API is not available in the linker [public API](https://github.com/mono/linker/tree/master/src/linker/ref). we work around it by adding `src/Microsoft.Android.Sdk.ILLink/Profile.cs` with missing pieces. * `TypeDefinition.GetMethods` extension method from `Mono.Tuner.MethodBodyRocks` is not public. It is very simple so we are inlining it. * the ILLink is now enabled in `Release` configuration defaults. * tests were updated to reference more packages, to not miss second level dependencies. Initial results: apkdiff output summary for HelloAndroid sample, comparing `Debug` and `Release` apk's ``` - 7,300 Davik executables -2.34% (of 311,436) - 14,733,944 Assemblies -31.85% (of 46,265,064) - 2,492,452 Shared libraries -11.43% (of 21,803,164) - 15,528,456 Package size difference -28.70% (of 54,114,462) ``` Context: * `_RunILLink` target https://github.com/dotnet/sdk/blob/master/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.ILLink.targets * linker documentation https://github.com/mono/linker/tree/master/docs Co-authored-by: Jonathan Peppers <jonathan.peppers@microsoft.com> Co-authored-by: Jonathan Pryor <jonpryor@vt.edu>

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Initial ILLink support #4707

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