Add Beamline State Machine and AggregatedState

[cappel89]

Draft for AggregatedStates and state machine. To test, use a config like the following one:

alignment: # AggregatedStateConfig -> can have different labels and for each label, different devices
  transition_metadata: # optional field for metadata for each label
    field: value 
  devices:
    samx:
      value: 0
      abs_tol: 0.1
      low_limit:
        value: -20
        abs_tol: 0.1
      high_limit:
        value: 20
        abs_tol: 0.1
      signals:
        velocity:
          value: 5
          abs_tol: 0.1
    bpm4i:
      value: 100
      abs_tol: 10
measurement:
  devices:
    samx:
      value: 19
      abs_tol: 0.1
      signals:
        velocity:
          value: 20
    samy:
      value: 0
      abs_tol: 0.1
test:
  devices:
    samy:
      value: 0
      abs_tol: 0.1
    bpm4i:
      value: 100
      abs_tol: 10

Assuming this config is stored under state_config.yaml, you can now load it as follows

filename = "./state_config.yaml"
bec.state_machine.load_from_config(name="my_state", config_path=filename)

[codecov]

Codecov Report

❌ Patch coverage is 77.14286% with 48 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
bec_lib/bec_lib/bl_states.py	73.62%	35 Missing and 13 partials ⚠️

📢 Thoughts on this report? Let us know!

[cappel89]

closed in favor of #866