SPI: Expose timing delays

[bjoernQ]

MISO dummy delay
dummy delay
These are derived from a number of input params, including the expected bus speed etc so we need to take that into account.

[bjoernQ]

I'm not sure what this issue is asking for? SPI_DINx_MODE, SPI_DINx_NUM and SPI_DOUTx_MODE?

[Dominaezzz]

That's what it sounds like to me.

[bugadani]

Indeed this issue sounds like it's about "Timing Compensation" (ESP32-S3 TRM (v1.6) 30.8, or ESP32 TRM (v5.2) 7.4.2, for example)

I believe this should be a backwards compatible config addition. We should be careful, because ESP32 may need different values depending on DMA and Mode, but if we make the configuration Optional, we can let the driver choose for the user if nothing is given, but make it the user's responsibility to provide values that work if they need to.

I'll mark this as a done+non-blocker, and we can reset if this solution ends up inadequate in a way that requires breaking the API.