Update on "[ET-VK][ez][Ops] registering Q/DQ/CQP ops and specifying optimal storage"

# Context

Certain quantization operators need scales and zeros to be set with a storage layout as buffers. Since the existing op_registry does not allow specifying how input parameters are set with their memory or storage layout, we need to specify that the optimal storage type is buffer so that is conversion pass is added to ensure that the inputs are also buffers.

# Changes

This moves the quantized_decomposed operators in their own registration, while also specifying that buffer is preferred.

Differential Revision: [D77746131](https://our.internmc.facebook.com/intern/diff/D77746131/)

[ghstack-poisoned]

Author: morelos