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This is part 1 of caching for smart pointer accessors, building on top of the CachedConstAccessorsLattice, which caches "normal" accessors. Smart pointer accessors are a bit different in that they may: - have aliases to access the same underlying data (but potentially returning slightly different types like `&` vs `*`). Within a "checked" sequence users may mix uses of the different aliases and the check should apply to any of the spellings. - may have non-const overloads in addition to the const version, where the non-const doesn't actually modify the container Part 2 will follow and add transfer functions utilities. It will also add a user UncheckedOptionalAccessModel. We'd seen false positives when nesting StatusOr<optional<T>> and optional<StatusOr<T>>, etc. which this can help address.