[ET-VK][ez] Support convolutions with padding > 0 and dilation > 1 (#10148)

## Context

As title.

## Changes

Modified convolution shader to set starting input position correctly when padding and dilation are both greater than 0.

Removed safeguard check for padding = 0 when dilation > 1 in C++ implementation.

Differential Revision: [D72879342](https://our.internmc.facebook.com/intern/diff/D72879342/)