add Windows support

[ndac-todoroki]

ref: #655
prev (wrong): #673

Fix points

• quit using single-quotes in package.json scripts (single-quotes won't be recognized in Windows run-s)
• use Uri.fsPath() instead of Uri.path()
  • https://github.com/microsoft/vscode-uri/blob/main/src/uri.ts#L178-L209
  • passing POSIX-type uri string was causing ENOENT error inside child_process add Windows support #673 (comment)

Notes

Tests

Local tests are not working on Windows.
We may need to fix all occurrences of path.foo() as path.posix.foo(), for example:

- const extensionDevelopmentPath = path.resolve(__dirname, '../..')
+ const extensionDevelopmentPath = path.posix.resolve(__dirname, '../..')

But since tests on Windows weren't running from the beginning, we might be able to fix this afterwards, since this change affects all test files and also CI for POSIX systems.

(opinions are welcome...)

To have direnv work on Windows

After you install direnv on Windows and before launching vscode, you need to have your Environmental values set.
refer to: direnv/direnv#1105
(this might be fixed in the future)

Note that you need to set your machine-wide env values, so the commands should be e.g.

setx DIRENV_CONFIG %APPDATA%\direnv\conf /m

(using setx ... /m, instead of set)

on CMD.exe, or

[Environment]::SetEnvironmentVariable('DIRENV_CONFIG', '%APPDATA%\direnv\conf', 'Machine')

on PowerShell.

[mkhl]

Awesome, thank you!