Jonathan Dickinson 322f9cb153
fix (rp i2c): fix restart/stop flags for i2c master methods
Update the start and stop flags for all read/write/read_write methods to match
those in the default blocking implementation of these methods (as well as
other RP2040 I2C implementations, and expected I2C behavior).

Also adds a write_read_async method that doesnt require using embedded-hal, as
this is required to use I2C in an idiomatic fashion (see TI Application Report
SLVA704).
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