[mlir][mesh] Add endomorphism simplification for all-reduce (#73150)

Does transformations like
all_reduce(x) + all_reduce(y) -> all_reduce(x + y)

max(all_reduce(x), all_reduce(y)) -> all_reduce(max(x, y))
when the all_reduce element-wise op is max.

Added general rewrite pattern HomomorphismSimplification and
EndomorphismSimplification that encapsulate the general algorithm.
Made specialization for all-reduce with respect to
addf, addi, minsi, maxsi, minimumf and maximumf
in the Arithmetic dialect.