[WIP] Experiment serialization and reconstruction

[ItamarGoldman]

Summary

This PR will able the user to save and load experiment object to the result_db. This issue was discussed in #1392

Details and comments

Tasks to complete this PR:

• [ ] make save experiment flag to save experiment config to the result_db

• [x] Add serialization of both Experiment obj, Analysis obj and figure related obj (for plotter, drawer and figure options)

• [x] Use the provider to add the correct backend to the experiment object.

• [ ] Make a utility function to load experiment and experiment data simultaneously.

• [ ] Add tests for simple experiment loading and saving

• [ ] Add tests for composite experiments, e.g. flat, nesting etc..

• This feature was requested by the experimentalists.

PR checklist (delete when all criteria are met)

• [x] I have read the contributing guide CONTRIBUTING.md.
• [ ] I have added the tests to cover my changes.
• [ ] I have updated the documentation accordingly.
• [ ] I have added a release note file using reno if this change needs to be documented in the release notes.