Feature/cores3 mic

[meganetaaan]

This is a draft PR to add microphone support for M5Stack CoreS3

• Add microphone (ES7210 audio ADC) configuration for M5Stack CoreS3 setup-target sequence
• Extend AudioIn class to support stereo input, I2S Philips format, and MCK pin configuration required by ES7210
  • All new settings have default values, ensuring backward compatibility with other targets
• ES7210 initialization and I2S settings for M5Stack CoreS3 are based on the https://github.com/m5stack/M5Unified

Changes

M5Stack CoreS3 Target

• Update manifest.json audio input settings:
  • Change from PDM to I2S standard format
  • Set sample rate to 16000 Hz
  • Enable stereo (2 channels) with I2S_STD_SLOT_BOTH
  • Add MCK pin configuration (pin 0)

ES7210 Driver (setup-target.js)

• Add ES7210 class for microphone initialization
• Configure microphone gain, HPF, and power settings
• Enable AXP2101 ADC for voltage measurement

Audio Input Module (modules/io/audioin/esp32/audioin.c and modules/pins/audioin/esp32/audioin.c)

• Add MODDEF_AUDIOIN_I2S_MCK_PIN for master clock pin support (default: I2S_GPIO_UNUSED)
• Add MODDEF_AUDIOIN_I2S_FORMAT_I2S for I2S Philips format selection (default: 0)
• Add MODDEF_AUDIOIN_NUMCHANNELS for mono/stereo configuration (default: 1)
• Add MODDEF_AUDIOIN_I2S_SLOT for flexible slot selection (default: I2S_STD_SLOT_RIGHT)