[VPlan] Move auxiliary declarations out of VPlan.h (NFC). (#124104) Nothing in VPlan.h directly depends on VPTransformState, VPCostContext, VPFRange, VPlanPrinter or VPSlotTracker. Move them out to a separate header to reduce the size of widely used VPlan.h. This is a first step towards more cleanly separating declarations in VPlan. Besides reducing VPlan.h's size, this also allows including additional VPlan-related headers in VPlanHelpers.h for use there. An example is using VPDominatorTree in VPTransformState (https://github.com/llvm/llvm-project/pull/117138). PR: https://github.com/llvm/llvm-project/pull/124104
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