Some type annotations say `str` but function actually expects list of `str`s

[JHertz5]

There are a few functions, e.g. vunit.ui.set_compile_option that have type annotations indicating that they expect a str for value, when actually they expect a list of str. This throws up errors on my python linter when using VUnit in python scripts.

I'm planning to raise a PR to hopefully resolve this.

[JHertz5]

Since the latest VUnit releases support only Python3.10+, I can use the simpler | syntax for multiple type annotations rather than having to use the pre 3.10 Union from typing.

[JHertz5]

I've created PR#1206 to resolve this issue.