[declare] Move proof_entry type to declare, put interactive proof data on top of declare.

This PR is a follow up to #10406 , moving the then introduced
`proof_entry` type to `Declare`.

This makes sense as `Declare` is the main consumer of the entry type,
and already provides the constructors for it.

This is a step towards making the entry type private, which will allow
us to enforce / handle invariants on entry data better.

A side-effect of this PR is that now `Proof_global` does depend on
`Declare`, not the other way around, but that makes sense given that
closing an interactive proof will be a client of declare.

Indeed, all `Declare` / `Pfedit` / and `Proof_global` are tied into
tactics due to `abstract`, at some point we may be able to unify all
them into a single file in `vernac`.

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