builtin actor manager and scan interlock actor

[d-perl]

Adds a BuiltinActorManager in which we can run permanently-running hardcoded actors.
Adds an implementation of such, a base BeamlineStateActor and a ScanInterlockActor which locks the primary queue when specified beamline states go out of range.

[codecov]

Codecov Report

❌ Patch coverage is 81.59722% with 53 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
bec_server/bec_server/actors/actor.py	60.65%	19 Missing and 5 partials ⚠️
bec_server/bec_server/actors/scan_interlock.py	81.81%	8 Missing and 4 partials ⚠️
bec_lib/bec_lib/messages.py	76.00%	3 Missing and 3 partials ⚠️
..._server/bec_server/actors/builtin_actor_manager.py	91.37%	4 Missing and 1 partial ⚠️
bec_lib/bec_lib/bl_state_manager.py	40.00%	3 Missing ⚠️
bec_server/bec_server/scan_server/scan_server.py	75.00%	2 Missing ⚠️
bec_lib/bec_lib/builtin_actor_hli.py	97.72%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!

[wakonig]

The enabling / disabling logic seems to be broken: I tried to play around with the flags in a second client but it seems not work as expected.

Scenario I: I had the interlock enabled and triggered, a scan was pending. I disabled the interlock but the scan did not continue until the returned to a valid state.

Scenario II: I started with a disabled interlock actor and enabled it mid scan. I would expect that the scan is stopped and repeated but it simply continued without respecting the beamline state.

[wakonig]

works as expected!

As discussed offline, there are still some open points but I would suggest to merge it as is now and refine it in another PR to allow the widget development to proceed in the meantime.