[mlir][Linalg] Conv {1,2,3}D ops defined with TC syntax

[mlir][Linalg] Conv {1,2,3}D ops defined with TC syntax

Replaced definition of named ND ConvOps with tensor comprehension
syntax which reduces boilerplate code significantly. Furthermore,
new ops to support TF convolutions added (without strides and dilations).

Reviewed By: nicolasvasilache

Differential Revision: https://reviews.llvm.org/D84628