feat: add MaxonActuator brushed motor support

[ninankh]

**Depends on #531 ** — this PR is built on top of that branch and includes its commits. Please review/merge #531 first; this diff will shrink to just the new changes once that's merged and this PR is retargeted to main.

Summary

Adds brushed motor support via a new MaxonActuator class, with the base
Actuator class updated to accommodate the brushed motor control interface.
Includes unit tests and a tutorial with sample usage code.

Changes

• MaxonActuator: new brushed motor actuator implementation (H-bridge PWM control)
• Actuator base class: updated to support brushed motor configuration
• Unit tests added for MaxonActuator and updated base class behavior
• Tutorial added under tutorials/ with sample code demonstrating homing and commanding motor position.

Testing

• Added pytest coverage for MaxonActuator and affected base class paths
• Ran make test locally, all passing
• Ran make check for lint/format compliance
• Manually verified tutorial sample code runs end-to-end

Checklist

• Tests included for new functionality
• Tutorial/docs added for new functionality

[codecov]

Codecov Report

❌ Patch coverage is 98.57456% with 13 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
opensourceleg/sensors/adc.py	98.3%	8 Missing and 1 partial ⚠️
opensourceleg/actuators/brushed.py	98.4%	2 Missing and 1 partial ⚠️
opensourceleg/sensors/hall.py	98.4%	0 Missing and 1 partial ⚠️

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