[MLIR][NFC] Move some of the affine transforms / tests to dialect dirs

Move some of the affine transforms and their test cases to their
respective dialect directory. This patch does not complete the move, but
takes care of a good part.

Renames: prefix 'affine' to affine loop tiling cl options,
vectorize -> super-vectorize

Signed-off-by: Uday Bondhugula <uday@polymagelabs.com>

Differential Revision: https://reviews.llvm.org/D76565