[clang-tidy] add IgnoreMacros option to readability-uppercase-literal-suffix
And also enable it by default to be consistent with e.g.
This helps e.g. when running this check on client code where the macro
is provided by the system, so there is no easy way to modify it.
Reviewed By: JonasToth, lebedev.ri
Differential Revision: https://reviews.llvm.org/D56025