[mlir][loops] Add getters for multi dim loop variables in `LoopLikeOpInterface` (#94516)

This patch adds `getLoopInductionVars`, `getLoopLowerBounds`,
`getLoopBounds`, `getLoopSteps` interface meth

[mlir][loops] Add getters for multi dim loop variables in `LoopLikeOpInterface` (#94516)

This patch adds `getLoopInductionVars`, `getLoopLowerBounds`,
`getLoopBounds`, `getLoopSteps` interface methods to
`LoopLIkeOpInterface`. The corresponding single value versions have been
moved to shared class declaration and have been implemented based on the
new interface methods.

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[mlir][scf] Implement conversion from scf.forall to scf.parallel (#94109)

There is currently no path to lower scf.forall to scf.parallel with the
goal of targeting the OpenMP dialect.

In the SCF

[mlir][scf] Implement conversion from scf.forall to scf.parallel (#94109)

There is currently no path to lower scf.forall to scf.parallel with the
goal of targeting the OpenMP dialect.

In the SCF->ControlFlow conversion, scf.forall is briefly converted to
scf.parallel, but the scf.parallel is lowered directly to a sequential
loop. This makes experimenting with scf.forall for CPU execution
difficult.

This change factors out the rewrite in the SCF->ControlFlow pass into a
utility function that can then be used in the SCF->ControlFlow lowering
and via a separate -scf-forall-to-parallel pass.

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Co-authored-by: Spenser Bauman <sabauma@fastmail>

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