TOSA v0.50.0 serialization library release tag

- Added support for FP16 and BF16. Float data type renamed to FP32
- Updated the flatbuffers submodule to version 2.0.6.

1. 485a11d FP16 support in serialization by James Ward · 1 year, 10 months ago
2. 2a3ca93 Modify CMakeLists to ease integration with Arm NN. by Colm Donelan · 1 year, 10 months ago
3. 87de41f Build flatbuffers into libtosa_serialization.a by Kevin Cheng · 2 years, 7 months ago
4. 2364dcd Initial commit of serialization library code by Eric Kunze · 3 years, 1 month ago