Remaining work on xeus-cpp-lite

[anutosh491]

• Verify if latest emsdk versions can be used for having emscripten build for xeus-cpp and cppinterop . Emscripten-forge currently only checks against 3.1.45/3.1.58. But It seems 3.1.72 is out and that might be just benefit us in a positive way.
• Address Fix kernel configuration for xeus-cpp-lite #185
  Our emscripten kernel isn't configured perfectly. Hence currently we might not have a clean way to configure if our kernel is based on c++17 or c++20
• Emscripten provides us with --preload-file that we need to use as of now to load files into the include dir of the virtual file system emscripten provides. But this flag can only be used once. Hence we can't do

-- preload-file sysroot
-- preload-file resouce-dir

We probably need to bundle these together and provide a final --preload-file PATH

• Finish Skip computing resource dir and include paths for xeus-cpp-lite #183

[anutosh491]

Verify if latest emsdk versions can be used for having emscripten build for xeus-cpp and cppinterop . Emscripten-forge currently only checks against 3.1.45/3.1.58. But It seems 3.1.72 is out and that might be just benefit us in a positive way.

1. We can get a better static build for cppinterop using emsdk 3.1.73 hence we should be doing that.
2. Migrate emscripten-forge to 3.1.73 and host all recipes required there.
3. Then use the same for building xeus-cpp-lite.