Support the bindings to be more integrable with a system's coherent memory management.
Pleaes note that thorvg now only allow the desinated memory allocators here:
malloc -> tvg::malloc
calloc -> tvg::calloc
realloc -> tvg::realloc
free -> tvg::free
issue: https://github.com/thorvg/thorvg/issues/2652
We've investigated two json parsers, simdjson & rapidjson.
Since the size is higer priorty for thorvg, we adopted rapidjson.
It's under MIT license.
See: https://github.com/Tencent/rapidjson
