Having the header granularized makes it possible to remove the
dependency on this header in <format>. This <format> header gets
included in more headers due to more usage of std::formatter in the
library. This should reduce the number of transitive includes.
Note formatting the new headers will be done in a followup patch.
Reviewed By: #libc, ldionne
Differential Revision: https://reviews.llvm.org/D145590
