[mlir][Linalg] Update ReshapeOp::build to be more idiomatic

Summary:
This diff makes it easier to create a `linalg.reshape` op
and adds an EDSC builder api test to exercise the new builders.

Reviewers: ftynse, jpienaar

Subscribers: mehdi_amini, rriddle, burmako, shauheen, antiagainst, arpith-jacob, mgester, lucyrfox, aartbik, liufengdb, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D72580