[Toybox] [PATCH] Add i2ctransfer.

[enh]

Tested on a Raspberry Pi 400 with a BME680 connected to the relevant
pins, and commands like `i2ctransfer 1 w3 at 0x77 0x60 0xb6 0xd0 r1`, which
writes 0xb6 to register 0x60 of chip 0x77 on bus 1, and then reads one
byte.
---
 toys/other/i2ctools.c | 101 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 101 insertions(+)
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