Support Save and Restart

[superstar54]

Save

Add WorkTree.save method, it will

• will create a process node for the first
• check the difference, and find the modified nodes, append the reset action to the message queue.

Restart

Add restart and new keyword arguments to the submit method.

• submit(restart=True) will restart the worktree, and only re-run the modified nodes
• submit(new=True) will reset the worktree, and submit a new calculation.

Here is an example:

from aiida_worktree import WorkTree
wt2 = WorkTree.load(pk)
wt2.name = "restart_workflow"
wt2.nodes["add2"].set({"y": Int(10).store()})
# use the `restart` flag to restart the workflow
wt2.submit(wait=True, restart=True)