audio_i2sin module for espressif and raspberrypi

[FoamyGuy]

Adds audio_i2sin.I2SIn class. Only enabled/implemented for espressif and raspberrypi ports currently.

Two new manual test scripts are included in the PR that were used to verify the functionality of the module. Recording to an SDCard, and sound reactive neopixels.

Sparkle Motion board def is updated to include the pins that the I2S mic is connected to.

Testing:

• Tested with mic built-in to sparkle motion and with https://www.adafruit.com/product/6049
• Record to sdcard works successfully on espressif port. On raspberrypi it seems like it's taking too long to write data to the sdcard and it's causing the recording to take too long and be broken up. All testing was with SPI and sdcardio. Might be worth testing sdio?
• Sound reactive neopixels work under espressif and raspberrypi. I tested with sparkle motion, ESP32 Huzzah feather, ESP32 S3 TFT feather, RP2040 feather, and RP2350 feather.