This CL introduces 'PluginProgram' in IFRT and exposes this in python via `xla_client.compile_ifrt_program()`.
This CL introduces 'PluginProgram' in IFRT and exposes this in python via `xla_client.compile_ifrt_program()`.

The IFRT `PluginProgram` is simply a wrapper for arbitrary byte-strings: an IFRT backend that recognizes `PluginProgram` can interpret the byte-string in any way it sees fit.
