Fixed [-1:-1] unexpected end of stream of schema_compiler in LLVM18 OSX

[pentatonick]

Fixed ifstream::readsome() returning empty in LLVM18 OSX.

std::basic_istream<CharT,Traits>::readsome is very implementation specific and was returning empty in LLVM18 OSX.

stringstream was used as a in memory stream to allow readsome() to return non-empty

Reference: https://en.cppreference.com/w/cpp/io/basic_istream/readsome

[pentatonick]

Build failed with:

/home/runner/work/minecpp/minecpp/tool/trace_tool/src/Main.cpp:18:16: error: no member named 'put_time' in namespace 'std'
   return std::put_time(std::localtime(&c_time), "%FT%T%z");

No changes were made to this file since last successful build. Something must have changed in the latest ubuntu update used by the Docker image. I have this file patched locally to compile in OSX but was not needed until this failed build.

Will retry. If fails, will #include <iomanip> // for std::put_time on the failing file in a separate PR.