Prefer unpacking over concatenating (RUF005)

[Avasam]

This also opens the door to using more tuples and generators in these places for further optimizations
Used Ruff to find these and prevent regressions

https://docs.astral.sh/ruff/rules/collection-literal-concatenation/

[...] collections can be concatenated more efficiently using the unpacking operator (e.g., [*x, *y] to concatenate x and y).
[...] The * operator can unpack any iterable, whereas + operates only on particular sequences which, in many cases, must be of the same type.

Closes #775

[mhammond]

I'm fairly ambivalent about this one - I think ever Python programmer understands list concatenation. What's the motivation here?

[Avasam]

What's the motivation here?

The idea is to get more performant code, essentially "for free" (as in you don't have to think much about it, since it's autofixed).

This would be even better if astral-sh/ruff#10592 gets implemented. In the mean time I've fixed nested unpacking manually (searching for regex \*\(.*\*.+\) and for the string *tuple)

[Avasam]

data_files type issue should be solved by python/typeshed#15146 (setuptools first-party equivalent: pypa/setuptools#5021). Setting as draft until that's published.