[Android][CoreCLR] Add runtimeconfig.json support for test host

[davidnguyen-tech]

Description

On CoreCLR Android test host, the configuration of the runtime using runtimeconfig.json isn't supported at the moment. Because of this, some runtime switches cannot be implemented.

Tasks

• Add support for runtimeconfig.json on CoreCLR Android test host.

[dotnet-policy-service]

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

[dotnet-policy-service]

Tagging subscribers to this area: @hoyosjs
See info in area-owners.md if you want to be subscribed.