Ports: Add flatbuffers library (#6050)

The flatbuffers library is a serialization library, created by Google
for game development and performance-critical applications.
It aims to be fast and efficient.

This commit creates a port of it to SerenityOS.

The flatbuffers build process generates three things: some header files,
a library (libflatbuffers) and a schema compiler (flatc).

There are tests, but they are not compiled, because it runs the
flatbuffers schema compiler, one of the things we are cross-compiling.
The compiler will not run because the target is different from the host

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