Refactor + Migrate convolution to non-fatal failure pattern

Summary: Factors out utilities used in `op_convolution` to `kernel_ops_util`, which can be shared between all ops that use a 2D kernel pattern (i.e. accepts `stride`, `padding`, `dilation`.

Reviewed By: guangy10

Differential Revision: D48405102

fbshipit-source-id: aa5d6d43aaa6ed5655f0fca99b4d0f59a00b060c