feat: Improve BlueapiClient to add plan parameter type hints

[oliwenmandiamond]

Fixes #1505

Improves the help text for a plan to add the type hints and correct default values.

Before change:

>>> bc.plans.grid_analyserscan
grid_analyserscan(analyser, sequence, detectors, args, snake_axes=None, md=None)

>>> bc.plans.count
count(detectors, num=None, delay=None, metadata=None)

With this change

>>> bc.plans.grid_analyserscan
grid_analyserscan(
    analyser: ElectronAnalyserDetector,
    sequence: AbstractBaseSequence,
    detectors: list[Readable],
    args: Any,
    snake_axes: list[Any] | bool | None = None,
    md: dict | None = None
)

>>> bc.plans.count
count(
    detectors: list[Readable],
    num: int = 1,
    delay: float = 0,
    metadata: dict | None = None
)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.29%. Comparing base (107d54e) to head (6272b42).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1469      +/-   ##
==========================================
+ Coverage   95.25%   95.29%   +0.03%     
==========================================
  Files          43       43              
  Lines        3163     3186      +23     
==========================================
+ Hits         3013     3036      +23     
  Misses        150      150              

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