STY: special: use indent width of 4 in clang-format

[lucascolley]

Reference issue

#19613 (comment)
#19613 (comment)

What does this implement/fix?

• Changes from indent width 2 to 4 in the clang-format of scipy/special/special
• Adds git blame ignores for the style only changes

Additional information

[lucascolley]

@izaid I went ahead and did this

[steppi]

Thanks @lucascolley. While were at it, @izaid, is it cool if we set the ColumnLimit to something smaller like 90? I like to code with two windows open side by side.

Edit:
Ah, looks like the smaller column limit might cause trouble with SPECFUN_HOST_DEVICE in every function declaration

[izaid]

Thanks @lucascolley! That's actually really helpful!

I'm less keen on changing the columnwidth.

[steppi]

I'm less keen on changing the columnwidth

Yeah. I’m working on porting cephes stuff now and saw the shorter column width isn’t working out.

[steppi]

Looks good to me.