gh-117431: Adapt bytes and bytearray .find() and friends to Argument Clinic (#117502)

This change gives a significant speedup, as the METH_FASTCALL calling
convention is now used. The following bytes and bytearray methods are adapted:

- count()
- find()
- index()
- rfind()
- rindex()

Co-authored-by: Inada Naoki <songofacandy@gmail.com>