[VPlan] Add VPInstruction::StepVector and use it in VPWidenIntOrFpInductionRecipe (#129508)

Split off from #118638, this adds VPInstruction::StepVector, which
generates integer step vectors (0,1,2,...,VF). This is a step towards
eventually modelling all the separate parts of
VPWidenIntOrFpInductionRecipe in VPlan.

This is then used by VPWidenIntOrFpInductionRecipe, where we materialize
it just before unrolling so the operands stay in a fixed position.

The need for a separate operand in VPWidenIntOrFpInductionRecipe, as
well as the need to update it in
optimizeVectorInductionWidthForTCAndVFUF, should be removed with #118638
when everything is expanded in convertToConcreteRecipes.

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