[JIT] Support All Python String methods

Tracking issue for parity with python strings.

• capitalize()
• casefold() - skipped
• center()
• count()
• encode() - maybe skip this one since everything is already unicode
• endswith()
• expandtabs()
• find()
• format()
• format_map() - skipped
• index()
• isalnum()
• isalpha()
• isdecimal()
• isdigit()
• isidentifier()
• islower()
• isnumeric()
• isprintable()
• isspace()
• istitle()
• isupper()
• join()
• ljust()
• lower()
• lstrip()
• maketrans() - skipped
• partition()
• replace()
• rfind()
• rindex()
• rjust()
• rpartition()
• rsplit()
• rstrip()
• split()
• splitlines()
• startswith()
• strip()
• swapcase()
• title()
• translate() - skipped
• upper()
• zfill()

Motivation

Users have run been blocked by lack of these methods in the past.

cc @suo