Make debug work with yarn 3 workspaces

[adriencaccia]

Fix #84

As explained in the comment of the second commit:

When using yarn 3 with workspaces though, the vitest executable can be present only in the project's root node_modules folder.

The solution I propose is to iterate recursively on parent directories until we find the vitest executable.

[seivan]

When using yarn 3 with workspaces though, the vitest executable can be present only in the project's root node_modules folder.

An alternative approach is to do what yarn itself does when it needs access to executables.
Going through pnipify is one option, another one is the same as the VSCode extension for mapping code through the archived files.

Wouldn't be too hard to map from the .pnp file.

[sheremet-va]

The extension was rewritten from the ground up in #253.

It doesn't support pnp yet, feel free to open a separate PR to fix that.