Add VREF wrapper to BSP

[aaravm4]

Just returns VREF for scaling adc readings.

[gemini-code-assist]

Code Review

This pull request updates the VS Code configuration for ARM-based Linux development, adds a function to retrieve the ADC reference voltage, and introduces a comprehensive CAN message header. Feedback identifies a bug in the adc_get_vref implementation where a channel macro is returned instead of a voltage value, unprofessional naming in the CAN header, incomplete test logic for ADC readings, and portability issues stemming from absolute paths in the workspace settings.

[aaravm4]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces a new adc_get_vref function to retrieve the ADC reference voltage, along with corresponding test cases in adc_test.c. The review feedback highlights several critical issues that need to be addressed: a stack buffer overflow in adc_get_vref caused by reading a 4-byte queue item into a 2-byte variable, a potential division-by-zero error, unsafe repeated initialization of a static queue, and logical issues in the test suite where success_handler() is called prematurely or omitted entirely. Additionally, it is recommended to make vref_readings static to prevent polluting the global namespace.

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