Cadence - refactor quantizer and passes (#3539)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/3539

Update the quantizer to the latest internal version, and heavily refactor it for readability and maintenance.

Reviewed By: cccclai

Differential Revision: D57082021

fbshipit-source-id: 947753859f6ffc5ea9ea0e803d2c4a0fd30bf608