Add support for CEVA BNO08x 9DoF sensor

[intermernet]

This PR adds support for the Adafruit BNO085 (CEVA BNO08x) 9DoF sensor. It's based off the Adafruit Arduino package at https://github.com/adafruit/Adafruit_BNO08x .

It implements most of the CEVA SH-2 / SHTP protocol whcih could be potentially moved into a separate package, but currently very few devices support it, so I have included it in this package

It has been tested with an Adafruit Metro 2350 and it seems to work well.

[deadprogram]

Thank you very much for working on this @intermernet

Perhaps you might want to look at the new pin package to avoid using the machine package directly.

Please see https://github.com/tinygo-org/drivers/blob/dev/internal/pin/internalpin.go

What do you think?

[intermernet]

@deadprogram I'll look at the pin package and see what refactoring I can do. Thanks for the heads up! I didn't know about it!

[intermernet]

@deadprogram I don't think the pin package applies to this driver, but I was erroneously using machine.I2C instead of the drivers.I2C interface. I have fixed this and the only remaining machine import is in the example code.

There are a bunch of linting errors related to unused functions/methods/consts/vars etc. These are mainly due to the implementation of the SH2 / SHTP protocols based on their respective specifications, and some of this isn't required in this driver.

There are also a few place-holders for more advanced functionality which isn't yet implemented.

What would you like me to do with these? I can comment them out and add TODOs, I can delete them altogether, or I can leave them in as they aren't actually causing errors and may help anyone else trying to extend this code in the future.

[deadprogram]

I was referring to https://github.com/tinygo-org/drivers/pull/809/files#diff-97e43ef0dd25e88f79e809472ccaf81ff6cf2010147aac700799a5a1aea595bdR35-R62 that seems like better off removed and replaced by using pin package.