tools/mpremote: Detach mpremote from pyboard.py.

This commit just takes the necessary parts of pyboard.py and merges them
with pyboardextended.py to make a new transport_serial.py, and updates the
rest of mpremote to use this instead.

It is difficult to continue to add features to mpremote (which usually
requires modification to pyboard.py) while also maintaining backwards
compatibility for pyboard.py.

The idea is that this provides a starting point for further refactoring of
mpremote to allow different transports (webrepl, BLE, etc).

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

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