Swap octoprint to use an external library

[rfleming71]

Proposed change

To prepare to switching octoprint over to config_flow, move the API code out into a library.

I used a client that has wrapper classes around the DTOs, which required a few other changes. If the HA teams prefers the client return json instead, I can update to do that.

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[MartinHjelmare]

Looks good!

@frenck?

[rfleming71]

The code seems to be failing on import homekit config. Any pointers in hunting down what broke?

[MartinHjelmare]

Most likely a flaky test unrelated to this PR. I restarted CI.

[frenck]

A couple of small comments. All-in-all, good job!

[frenck]

First attempt with an invalid host resulted in:

2021-02-23 13:24:19 ERROR (MainThread) [homeassistant.components.sensor] Error while setting up octoprint platform for sensor
Traceback (most recent call last):
  File "/home/frenck/code/home-assistant/home-assistant/homeassistant/helpers/entity_platform.py", line 200, in _async_setup_platform
    await asyncio.shield(task)
  File "/home/frenck/code/home-assistant/home-assistant/homeassistant/components/octoprint/sensor.py", line 36, in async_setup_platform
    if coordinator.data["printer"]:
TypeError: 'NoneType' object is not subscriptable

A second attempt at my Octoprint dev instance (which has no permanent printer connected):

2021-02-23 13:27:06 ERROR (MainThread) [homeassistant.components.octoprint] Failed to update printer data 0, message='Attempt to decode JSON with unexpected mimetype: text/html; charset=utf-8', url=URL('http://10.10.11.125:80/api/printer')

Third attempt with a printer actively connected worked.

[rfleming71]

Both situations should be fixed with more reasonable exception messages into the log file. Updated the data update to only catch the printer offline exception and let anything from the getjob get raised.

[frenck]

LGTM 👍