chore: reimplement mk_projections in Lean
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This PR translates `lean::mk_projections` into Lean, giving `Lean.Meta.mkProjections`. It also puts `hasLooseBVarInExplicitDomain` back in sync with the kernel version.
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This PR translates
lean::mk_projectionsinto Lean, addingLean.Meta.mkProjections. It also putshasLooseBVarInExplicitDomainback in sync with the kernel version. Deletessrc/library/constructions/projection.{h,cpp}.