[FEA] Extending the checkpointing utility to store metadata

[mnabian]

Modulus Pull Request

Description

Often times it is required to store some metadata with the checkpoints. This PR extends the checkpointing utility to enable that.

Checklist

• [x] I am familiar with the Contributing Guidelines.
• [x] New or existing tests cover these changes.
• [x] The documentation is up to date with these changes.
• [x] The CHANGELOG.md is up to date with these changes.
• [ ] An issue is linked to this pull request.

Dependencies