ADC DMA library

[crabel99]

Summary

Adds a new ADC library that provides higher-level ADC configuration, asynchronous reads, DMA-backed result handling, callback-based reads, chip-temperature helpers, and integration with the shared PendSV deferred service dispatcher.

This also updates SAMD_AnalogCorrection to use the new ADC implementation instead of duplicating correction logic.

Changes

• Add libraries/ADC

  • synchronous and asynchronous ADC reads
  • callback-based read completion
  • ADC channel registration and queueing
  • ZeroDMA-backed ADC result transfer support
  • SAMD21 and SAMD51 ADC register path support
  • chip temperature conversion helpers
  • examples for basic reads, callbacks, async temperature reads, and ADC correction

• Update SAMD_AnalogCorrection

  • remove duplicated implementation code
  • reuse the new ADC library correction API

• Use explicit ADC chip-family guards for D5x/E5x register layouts:

  • __SAMD51__
  • __SAME51__
  • __SAME53__
  • __SAME54__

Validation

• metro_m0: 29 succeeded, 0 failed, 37 skipped
• metro_m4: 25 succeeded, 0 failed, 41 skipped
• git diff --check pendsv-support-clean..HEAD passed