[MLIR] Parallelize affine.for op to 1-D affine.parallel op

Introduce pass to convert parallel affine.for op into 1-D affine.parallel op.
Run using --affine-parallelize. Removes test-detect-parallel: pass for checking
parallel affine.for ops.

Signed-off-by: Yash Jain <yash.jain@polymagelabs.com>

Differential Revision: https://reviews.llvm.org/D83193