ESP32 I2S 8/16 bits parallel channel support (WIP)

[awawa-dev]

The work is based on Makuna Esp32I2sX parallel development branch. I added some critical bug fixes and now the library is able to generate a well-formed signal using parallel output (still clock needs to be adjusted). Due to limitation 'true' 8 bits parallel mode is only available for i2s1 interface (NeoEsp32I2s1X8Ws2812Method). For ESP32/16bit mode there is a method NeoEsp32I2s0X16Ws2812Method, and for ESP32S2 (tested with mini lolin) NeoEsp32I2s0X8Ws2812Method: this method is 8 channels but it's working with 16 bits sample DMA. Both NeoEsp32I2s0X16Ws2812Method and NeoEsp32I2s0X8Ws2812Method are using I2S0 interface.

To do:

• Signal clock is too low. NeoEsp32I2s1X8Ws2812Method produces 400KHz signal and NeoEsp32I2s0X16Ws2812Method&NeoEsp32I2s0X8Ws2812Method produce 200KHz signal. Each of my attempts to increase the frequency results in doubling the DMA buffer at the output (but at least it's valid 800KHz).
• Regression testing. Due to the numerous changes that have taken place in this PR (especially regarding the critical clock) it is necessary to verify whether the single-channel methods using the ESP32 I2S still work properly.
• Add NeoEsp32I2s0X8Ws2812Method for ESP32 and NeoEsp32I2s0X16Ws2812Method for ESP32S2?
• Verify if ESP32-S2 methods are compatible with ESP32-C3

[Makuna]

Mostly some comment additions, one allocation move.

Also, make sure no tabs, tabs should be replaced with 4 spaces. Not that I had seen any, but the review tool doesn't make it easy to spot them.