Implement "rummage through container" activity

[KorGgenT]

Is your feature request related to a problem? Please describe.

Right now when you grab something from a container, it just removes the moves immediately. Theoretically it could take half a minute to rummage through a container in particularly unfavorable circumstances, so being able to cancel this action is quite important.

Describe the solution you'd like

Implement a new activity with the new activity actor infrastructure.

Describe alternatives you've considered

none, this is pretty straightforward imo

Additional context

As far as complexity for new features go, this is pretty straightforward. The obtain cost of an item is pretty easy to get if you have the item_location, and the activity doesn't have to do anything until it completes. the activity should start when the player tries to wield, drop, wear, activate, etc. an item from a container that you need to dig out, so it definitely will be an activity the player uses quite often.

[actual-nh]

This should probably be altered by the Disorganized trait. I'm not sure about Packmule - from personal experience, being good at finding places to shove in stuff does not (necessarily!) indicate being good at putting stuff easily accessible places (or for that matter being good at finding it again).

[actual-nh]

@guralub: (Same as Gura on discord?) Interested in tackling this one?

[github-actions]

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