Diagnostic CLI command for i2c

[laurentopia]

Current Behavior

I2C is a black box, a very very black box and a mag may not work for unknown reason

Desired Behavior

some clarity, at least a list of i2c peripherals

Suggested Solution

Add CLI command to list i2c peripheral addresses, it would help a lot

Who does this impact? Who is this for?

bn880 users, some times auto mag doesn't work

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[digitalentity]

I think figuring out I2C device addresses is out of scope for INAV since we can't allow arbitrary addresses anyway to avoid odd behavior. Most of I2C issues are hardware-related (mis-wiring, lack of pull-up resistors etc).

[laurentopia]

This is not about allowing arbitrary addresses, it's about listing addresses of everything on the i2c bus to help diagnostic.