* redesign for faster cpu/gpu synch
* load + more async CPU
* use command encoder API and move more ops to use it
* make fence back-end generic + CPU only fence
* faster build
* fix async eval
* fixes + handle temporaries
* fix / improve cpu conv
* remove unused status, fix siblings
* fix extensions
* fix
* fix no cpu build
* format
* comments
* fix perf regression, remove unecessary abort
* fix events, task limit cpu
* fix waiting
* fix donation / temporaries in normalization
* Added version.h providing mlx::core::version() returning std::string(MLX_VERSION)
Also, added MLX_VERSION_MAJOR, MLX_VERSION_MINOR, MLX_VERSION_PATCH, MLX_VERSION_NUMERIC, and accompanying functions.
* Added version.h to mlx.h
* Changed version int functions to be constexpr
* Formatting
* Added handling of MLX_VERSION where only the prefix has major.minor.patch format
* Changed version function to be constexpr
* export and import functions
* refactor + works for few primitives
* nit
* allow primitives with state
* nit
* nit
* simplify serialize / deserialize
* fix for constants
* python bindings
* maybe fix serialize failure case
* add example
* more primitives, training kind of works
* same result for python and c++
* some fixes
* fix export
* template it up
* some simplificatoin
* rebase
* allow kwargs and multiple functions
* exporter
* more primitives for exporting
* deal with endianness
* handle invalid stream
* add docstring
