Atomic HRS reads

[mark9064]

• Combines the reading of all HRS3300 registers into one I2C read so data is not partial
• Downsizes both HRS and ALS to 16bit as the sensor does not generate larger than 16bit values in its current configuration
  • Increasing the resolution by 1 bit doubles the sensor acquisition time, since we are already at 10Hz we are never going to use a higher resolution
  • The PPG algorithm buffers for ALS/HRS are already 16bit anyway
• Removes functions for setting gain / drive that are unused throughout the codebase

[github-actions[bot]]

Build size and comparison to main:	Section	Size	Difference
text	395908B	-48B
data	996B	0B
bss	63420B	0B