Inconsistent precision plugin filename suffix

[carmocca]

Proposed refactoring or deprecation

Current names:

pytorch_lightning/plugins/precision/
├── apex_amp.py
├── deepspeed_precision.py
├── double.py
├── fully_sharded_native_amp.py
├── ipu_precision.py
├── mixed.py
├── native_amp.py
├── precision_plugin.py
├── sharded_native_amp.py
├── tpu.py
└── tpu_bfloat.py

Motivation

Had to choose this when working on #10020

Pitch

ipu_precision.py -> ipu.py
deepspeed_precision.py -> deepspeed.py

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[puhuk]

Can I resolve this for my first contribution :)