fix(fmt): params_first_multi split if more than one param

[grandizzy]

Motivation

Closes #8761 - introduced breaking change for params_first

As suggested in #8761 (comment)
params_first Writes function parameters multiline first regardless number of params
params_first_multiline new option added which only splits parameters onto their own line when there is more than one param

Solution

[mds1]

@grandizzy this is great overall, thank you! It seems there might be one remaining issue though: we use multiline_func_header='all', and when running this new version, the diff is now significantly smaller, but there are still a few diffs that look odd and seem unexpected, as shown in the screenshots, all around if/else statements

[grandizzy]

@grandizzy this is great overall, thank you! It seems there might be one remaining issue though

yeah, was able to reproduce, will make a fix for