[libc] Support %lc in printf (#169983)
Add support for %lc in printf by calling internal wcrtomb function and
relevant end-to-end sprintf test. Additionally, modified printf parser
for recognizing length modifier and added two internal error codes. Also
added a flag to disable wchar support on windows platform. Resolves
#166598
Co-authored-by: shubh@DOE <shubhp@mbm3a24.local>
