[Codegen] Support multi-output consumers with permuted indexing maps (#24768)

Extend lowering of fused & tiled consumer ops from the basic case
(strictly identical indexing over the output operands). We now
generalize the logic for input indexing to support different output maps
that are simple permutations.

This allows to support some fusion cases where a simple transposition
from one of the consumer's connections get fused into the elementwise
generic, and then the consumer gets fused & tiled together with the
matmul. Whether we want such consumer fusion is a separate matter
subject to performance investigations, and in my reproducer there'd also
be an opportunity to fold redundant `tranpose(transpose(x))` instances,
avoiding the multi-output fusion altogether. For better stability, this
extension of the codegen is preferred as the first step.

Signed-off-by: Artem Gindinson <gindinson@roofline.ai>
Assisted by: Codex

---------

Signed-off-by: Artem Gindinson <gindinson@roofline.ai>