[Java.Interop.GenericMarshaler] fix trimmer warnings

Context: dotnet/android#9846

When trying to build `Mono.Android-Tests` for NativeAOT, I get many
warnings like this (that are upgraded to errors):

    src\Java.Interop.GenericMarshaler\Java.Interop.GenericMarshaler\JniPeerInstanceMethodsExtensions.cs(10874,17):
    error IL2091: 'T' generic argument does not satisfy 'DynamicallyAccessedMemberTypes.PublicConstructors', 'DynamicallyAccessedMemberTypes.NonPublicConstructors' in 'Java.Interop.JniRuntime.JniValueManager.GetValueMarshaler<T>()'. The generic parameter 'T16' of 'Java.Interop.GenericMarshaler.JniPeerInstanceMethodsExtensions.InvokeGenericVirtualObjectMethod<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16>(JniInstanceMethods, String, IJavaPeerable, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16)' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.
    Build failed with 2992 error(s) in 4.8s

To solve this here, we can import:

    <Import Project="..\..\build-tools\trim-analyzers\trim-analyzers.props" />

To see all the warnings *here*, and then I added the missing
attributes to solve the warnings.

src/Java.Interop.GenericMarshaler/Java.Interop.GenericMarshaler.csproj

@@ -8,6 +8,7 @@
   </PropertyGroup>
 
   <Import Project="..\..\TargetFrameworkDependentValues.props" />
+  <Import Project="..\..\build-tools\trim-analyzers\trim-analyzers.props" />
 
   <PropertyGroup>
     <OutputPath>$(ToolOutputFullPath)</OutputPath>