Add Neptune Orca CAN APIs

[Copilot]

Adds CAN communication support for FreeWili devices with Neptune Orca hardware (I2C address 0x48).

CAN APIs Added

• can_transmit() - Send CAN/CAN-FD messages on channels 0-1
• can_enable_streaming() - Enable/disable CAN RX event streaming
• can_set_transmit_periodic() - Configure periodic message transmission (8 slots per channel)
• can_enable_transmit_periodic() - Start/stop periodic transmission
• can_set_rx_filter() - Configure hardware RX filters (32 filters per channel)
• CANData.from_string() - Parse CAN event data with error handling for empty payloads

Testing

• Comprehensive test suite in test_can.py with hardware detection
• Tests use @pytest.mark.xfail to gracefully handle missing Neptune hardware
• Updated I2C tests to skip when Neptune is present (avoids false failures)

Documentation

• Added CAN, WilEye, and file download examples to examples.rst
• Fixed file mapping: .py files now correctly labeled "Python script"

Example usage:

with FreeWili.find_first().expect("No device") as dev:
    # Enable streaming and transmit
    dev.can_enable_streaming(0, True)
    dev.can_transmit(0, 0x123, bytes([0xAA, 0xBB]), is_canfd=True, is_extended=True)
    
    # Set up periodic transmission every 100ms
    dev.can_set_transmit_periodic(0, slot=0, period_us=100_000, 
                                   arb_id=0x55, is_canfd=True, 
                                   is_extended=True, data=bytes([...]))
    dev.can_enable_transmit_periodic(0, True)

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