Add runtime config option for static linkage

[am11]

This adds the ability to use statically linked binary to self using modern .NET interop APIs.

To opt-in, the consumer project file would have:

<ItemGroup>
  <RuntimeHostConfigurationOption Include="SQLitePCL.LinkageType.Static" Value="true" />
</ItemGroup>

or AppContext.SetSwitch("SQLitePCL.LinkageType.Static", true); in their initialization code (e.g. in their module initializer or some other static context).

https://learn.microsoft.com/dotnet/core/runtime-config/
https://learn.microsoft.com/dotnet/api/system.appcontext.setswitch

[am11]

@ericsink this is related to #582. I've used no-xamarin branch.

Another aspect of this work is to actually pack static libs alongside the dynamic libs in the nuget package, so users can link it in projects without needing to build ericsink/cb repo with -static option manually. e.g. browser-wasm is shipped with e_sqlite3.a only while linux-x64 is shipped with libe_sqlite3.so only. Would be nice to have static flavors for desktop runtimes as well.