[quant][graphmode][fx][eagermode] Add leaky relu support in quantization workflows (#45712)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45712
Eager mode will still be able to use functional leaky relu, but it will be less accurate than
LeakyReLU module.
FX graph mode will support both leaky relu functional and module
Test Plan: Imported from OSS
Reviewed By: z-a-f
Differential Revision: D24069961
fbshipit-source-id: 8d91c3c50c0bcd068ba3072378ebb4da9549be3b
