[shree-iyengar-dls]

Fixes #180

Summary of changes:

• class Plan in blueapi/core/bluesky_types.py is no longer a BlueapiBaseModel but is now a dataclass
• class Plan contains plan_function which is of the type PlanGenerator
• class PlanModel remains unchanged
• the changes above mean we no longer have the duplicated plan_functions dictionary in class BlueskyContext

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.46%. Comparing base (4353ae2) to head (34ce285).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1743   +/-   ##
=======================================
  Coverage   96.46%   96.46%           
=======================================
  Files          49       49           
  Lines        3791     3791           
=======================================
  Hits         3657     3657           
  Misses        134      134           

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