Stop models converting to camelCase

[callumforrester]

Previously with #132, all config, API parameter and plan model parameter names were converted to camelCase when loaded externally (e.g. from JSON). So

class TaskResponse(BlueapiBaseModel):
    """
    Acknowledgement that a task has started, includes its ID
    """

    task_name: str = Field(description="Unique identifier for the task")

Would accept the following via the API:

{"taskName": "my task"}

and a plan like

def my_plan(foo_bar: str) -> MsgGenerator:
    ...

Would accept:

{"name": "my_plan", "params": {"fooBar": "qwerty"}}

This PR removes all aliasing and we accept that there are snake_case models

[tpoliaw]

I would be in favour of this. Having the request format be able to take multiple forms just add confusion. eg how would it handle requests for

def demo(foo_bar: int = 42, fooBar: str = "42") -> MsgGenerator:
    pass

It's a slightly contrived example but I don't see the benefit to allowing variations in general.

[callumforrester]

I think you're right, I was assuming that code formatters would shout at people trying to use camel case arguments, but we can't rely on everyone having a formatter.

[callumforrester]

If no one strongly objects I'm going to merge this, will make life easier for artemis purposes

[codecov]

Codecov Report

Merging #173 (edb3058) into main (d31287f) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #173      +/-   ##
==========================================
- Coverage   89.90%   89.87%   -0.03%     
==========================================
  Files          41       41              
  Lines        1248     1245       -3     
==========================================
- Hits         1122     1119       -3     
  Misses        126      126              

Impacted Files	Coverage Δ
src/blueapi/utils/base_model.py	100.00% <100.00%> (ø)

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[tpoliaw]

Should non-plan models still allow camelCase aliasing? Seems weird if it works in some places but not others.