typing: add type hints to most mercurial/pycompat.py functions
The `rapply` methods are left out because it's not `rapply(f, xs: _T0) -> _T0`
as I first thought- it's used somewhere to walk a collection and convert between
bytes and str.
Also, the `open()` call is partially untyped because I'm not sure what its
purpose is at this point- both the name and mode can be either bytes or str as
it is currently constituted. It might make sense to assert that the file is
being opened in binary mode (like `namedtempfile()`) and cast the result to
`BinaryIO`, but that shouldn't be smuggled in with these other changes. The
return is currently typed as `Any` because something suddenly got smarter and a
few uses in util.py (like readfile()) suddenly think it returns `IO[str]`
instead of `IO[bytes]` (BinaryIO), and it flags the type mismatch there.
statprof: don't pass str `sys.argv` to a function expecting bytes
Found by typing the global functions in mercurial.pycompat.
typing: drop an unnecessary warning disabling comment in match.py
This stopped being necessary in
d2e1dcd4490d, when the exception stopped being
subscripted.