feat(lockfile) hide berry lockfile lifetime (#5436)
### Description
In order to let the package graph hold a lockfile we need to avoid
exposing a lifetime in the berry implementation. This PR changes the
internal representations to all be completely owned.
Alternatives considered:
- Continue with the self-referential struct, but have the lockfile
pinned and then use `mem::transmute` to mutate the required lifetimes to
be `static`. Attempted this, but ran into enough issues that it wasn't
looking like a quick refactor.
- Use
[ouroboros](https://docs.rs/ouroboros/0.17.0/ouroboros/attr.self_referencing.html)
to allow for the self-referential struct via the macro. In the future
this might be worth a look, but I didn't want to block on verifying that
we currently follow and in the future will follow all of the
restrictions this macro imposes.
### Testing Instructions
This shouldn't change any behavior, just makes it so doesn't require any
additional data.
`cargo instruments --example berry_resolutions -t time` shows that
execution is `68ms` which is still very reasonable. These changes do
increase memory pressure somewhat, but it's not unreasonable at all.
---------
Co-authored-by: Chris Olszewski <Chris Olszewski>
