Integrate with `vstest` Test Platform Protocols to enhance performance and consolidate code

[Issafalcon]

Using the VS Test Platform API (https://github.com/microsoft/vstest/blob/main/docs/RFCs/0007-Editors-API-Specification.md) to run test discovery and running tests will enable consolidation of code for each test runner currently in this adapter.

Using a listener in Nvim over a port for dotnet vstest will allow async updates for test discovery and streaming of test results straight from the Test Platform.

This will improve performance significantly.