[proof] Rework proof interface.

- deprecate the old 5-tuple accessor in favor of a view record,

- move `name` and `kind` proof data from `Proof_global` to `Proof`,
  this will prove useful in subsequent functionalizations of the
  interface, in particular this is what abstract, which lives in the
  monads, needs in order no to access global state.

- Note that `Proof.t` and `Proof_global.t` are redundant anyways.

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