refactor(robot-server): add /motors endpoints and tests

[amitlissack]

overview

Implement the /motors endpoints in robot-server's fastapi app

changelog

• separate the the motor models and routes from control into their own module
• port tests from aiohttp into fastapi.
• separate the tests into smaller tests.
• implement the endpoints

review requests

The ticket is to port the endpoint and unit tests.
I do not have a robot to test this on, so not 100% it will work on a robot.

risk assessment

Very low. These changes all live behind a feature flag which is not enabled.

closes #5192

[codecov]

Codecov Report

Merging #5242 into edge will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             edge    #5242      +/-   ##
==========================================
+ Coverage   61.41%   61.44%   +0.02%     
==========================================
  Files        1041     1043       +2     
  Lines       29609    29623      +14     
==========================================
+ Hits        18185    18201      +16     
+ Misses      11424    11422       -2     

Impacted Files	Coverage Δ
...obot-server/robot_server/service/models/control.py	100.00% <ø> (ø)
...ver/robot_server/service/models/json_api/errors.py	100.00% <ø> (ø)
...bot-server/robot_server/service/routers/control.py	74.07% <ø> (+0.54%)	⬆️
robot-server/robot_server/service/main.py	100.00% <100.00%> (ø)
robot-server/robot_server/service/models/motors.py	100.00% <100.00%> (ø)
...obot-server/robot_server/service/routers/motors.py	100.00% <100.00%> (ø)

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[sfoster1]

Small request to avoid data duplication but looks good otherwise

[mcous]

🛥 LGTM