fix(gnovm): persist function-local declared types referenced by saved values

[ltzmaxwell]

• Function-local declared types are never SetType'd (only package-level types are, at addpkg), so persisting a value referencing one writes a dangling RefType; after a node restart every access panics with unexpected type with id ... — the realm state is permanently unreadable. Reproduces on master via interface-typed package vars and closure captures.
• Fix: a localTypeSaver walk in saveObject persists reachable function-local types before SetObject; copyTypeWithRefs preserves ParentLoc so the local type's TypeID survives the persist/reload round trip.
• Defense-in-depth: a debugAssert-gated invariant in SetObject panics at save time on any dangling function-local type ref, so a missed route fails loudly inside the rolled-back tx instead of committing unreadable state.
• Tests: restart txtars are the true reproducers (fail on master) — interface var / closure / bound method value, cross-realm, p/-package local type, map-key TypeID stability, reload→mutate→resave across two restarts; zrealm_localtype* filetests guard the save side under -tags debugAssert and pin the on-the-wire RefType shape.
• Also unblocks fix(gnovm): match Go's call-time dispatch for interface-bound method values #5737, whose call-time method dispatch persists the interface-boxed operand and newly hits this hole. ADR: gnovm/adr/pr5894_local_type_persist.md.

[Gno2D2]

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[thehowl]

I think this approach is actually more sensible.

Other types may never end up being saved as values but we save them nonetheless. It just makes sense that the cost of storing a type is entirely at package init; not "on-demand". Also considering the fact that doing this on-demand has a hefty traversal cost we'd have to do; while if we just did this at preprocessing it wouldn't entail any further traversals.

[ltzmaxwell]

working on an alternative.

[ltzmaxwell]

close in favor of #5935.