Prerelease of new testing framework and test run UI in VS Code

This will be fantastic when all the bugs get ironed out. Thank you for developing this.

Unfortunately, it doesn’t seem to be working for me. Using this MWE

module Differentiation
using TestItems, TestItemRunner

@testitem "First tests" begin
    @test true
end

end # module 

I also get the circle spinning, though not forever. Eventually it crashes:

System info:

Julia language server v1.7.6

VSCode version
Version: 1.70.2 (user setup)
Commit: e4503b30fc78200f846c62cf8091b76ff5547662
Date: 2022-08-16T05:35:13.448Z
Electron: 18.3.5
Chromium: 100.0.4896.160
Node.js: 16.13.2
V8: 10.0.139.17-electron.0
OS: Windows_NT x64 10.0.22000
Julia version
julia> versioninfo()
Julia Version 1.8.0
Commit 5544a0fab7 (2022-08-17 13:38 UTC)
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: 16 × 11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-13.0.1 (ORCJIT, tigerlake)
  Threads: 8 on 16 virtual cores
Environment:
  JULIA_EDITOR = code.cmd
  JULIA_NUM_THREADS = 8