Optim - added quantization code.

[sgsharma2000]

Added quantization code mainly inside generator.py and model.py - but show very marginal improvements in timing for batch sizes.

[facebook-github-bot]

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[subramen]

Hi @sgsharma2000 firstly thank you for submitting this (fairly large) PR!

Reviewing your proposed changes will be much easier if you could batch your changes across multiple smaller and narrowly-scoped PRs. Please also include information on what changes you've made, what are you trying to achieve, and the rationale for your approach.