fix(completion): dotnu completion refactor, fixes path with space #139

Job	Run time
fmt-clippy (macos-13)	4m 36s
tests (macos-latest)	5m 4s
fmt-clippy (ubuntu-22.04)	1m 59s
tests (windows-latest)	5m 39s
tests (ubuntu-22.04)	4m 34s
std-lib-and-python-virtualenv (macos-latest, py)	5m 29s
std-lib-and-python-virtualenv (windows-latest, py)	14m 26s
plugins (windows-latest)	9m 42s
plugins (macos-13)	17m 16s
plugins (ubuntu-22.04)	4m 43s
std-lib-and-python-virtualenv (ubuntu-22.04, py)	4m 2s
Clippy WASM	2m 3s
fmt-clippy (windows-latest)	5m 54s
Build WASM	2m 3s
	1h 27m 30s

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