* add test file

* add new float_util files

* Add unit tests for bfloat. Fix bfloat rounding code since it was incorrectly rounding.

* add more tests

* cleanup

* change trucate to be endian agnostic

* prep work for constexpr ctors

* ready for constexpr

* constexpr ctor for bfloat16

* more bfloating

* write constexpr isnan since it is not constexpr on Macos

* remove cast operator

* add benchmark test and cleanup

* use aligned buffers for benchmark tests

* fix numbers printed in benchmark

* remove union and use cast operator

* all tests passing

* cleanup