Draft: Debugger: Commit before loading inputs

Context

Pave the road towards (1) being able to return in the past, and (2) align the behavior of the debugger on the rollup node. Another “next step” is also to be able to use an on-disk context in the debugger.

Manually testing the MR

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR