feat: move starting the DAC channel to the constructor to avoid a 1ms delay loop every time the Dac value is set

[daantimmer]

There is a 1ms delay in the HAL_DAC_Start function provided by ST. This is required for correct DAC startup behaviour.

However, it is not required to this every time a value is set. I propose to move the HAL_DAC_Start and related initialization code to when the DAC instance is instantiated, instead of every time a value is set.

[github-actions]

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