[feature] Add package_ids to lockfiles.

### What is your suggestion?

Hello,

There was a discussion about adding PREVs to conan 2 lockfiles in the docs repo. This ticket is to ask for package_id locks (not PREVs).

I understand the conan 2 logic behind not requiring package_ids, but at the very least it would document the build precisely. Maybe there is a workaround?

Thank you,

P.S. This is a very high-priority feature for us.

### Have you read the CONTRIBUTING guide?

- [x] I've read the CONTRIBUTING guide