Add alternate i2c bus support

[tyeth]

This is a change to add an extra constructor definition that supports passing a TwoWire object as well as the device address.

Tested as part of WipperSnapper firmware change
adafruit/Adafruit_Wippersnapper_Arduino#491

On Feather ESP32v2 and qtpyESP32s2

[tyeth]

@caternuson really appreciate if you could cast a quick eye over this

[tyeth]

Thanks @caternuson for the eagle eye, hopefully that's alright now the signature in the header file is resolved.

[caternuson]

Just to note - we'd probably have this stuff be in begin() instead of the ctor if this had originated with Adafruit. But since this is a fork, sort of stuck with the original interface design.

[caternuson]

Would also be nice to have CI at some point to catch things :(

[tyeth]

Definitely to both. I get the list of non-CI'd repo's each week so it's mentally on the todo list and likely to be not forgotten as it'll reduce the list of non-action results from adabot. Glad Adafruit is a fan of CI/automation in general