Allow DeepSpeed init to accept dictionary instead of args

[jeffra]

We should remove the need for args to be passed to deepspeed init, ideally we should accept a dictionary which represents everything so we can write smaller tests.

[jackshi0912]

+1
It would be better if init could ask the data it needs instead of handling file I/O and looking for params in args. Some systems may use very special methods to load yaml, json, protobuf, etc. into memory for initialization and configuration.

[jeffra]

In the process of implementing this enhancement we will consider removing the --deepspeed flag since this is not used internally in DeepSpeed code. It should be up to the user if they want to implement a DeepSpeed and non-DeepSpeed version of their code controlled by a flag.