Update Open-Sky Network Private Area API Example

[DJDevon3]

Private API, website credentials required. Instructions in code comments. More daily calls than Public API.
Pulls flight data from a geographic area. Example is around Orlando airport.

Added

• pretty serial hierarchy view
• general code cleanup and improvements
• improved endpoints with server side failure messages
• improved and streamlined debugging
• shouty constants to make Pylint happy.
• imports sorted
• switched from circuitpython_base64 to adafruit_binascii for base64 credential encoding
• doc strings for functions
• uses settings.toml by default
• now using Connection Manager by default

Changed from circuitpython_base64 community library to adafruit_binascii. It encodes to base64 much faster and has Adafruit library support. It's a better way to go for examples needing base64 encoding.

Serial output example:

Connecting to WiFi...
✅ Wifi!
 | Attempting to GET OpenSky-Network Area Flights JSON!
 | ✅ OpenSky-Network JSON!
 |  | Timestamp: 03/18/2024 07:00:20
 |  | Trans:ad4804 Sign:JBU2523 Origin:United States Time:1710744961 Last:1710744961 Lon:-81.327 Lat:28.4545 BaroAlt:83.82 Ground:False Vel:69.97 Head:179.16 VertRate:-3.58 Sens:None GeoAlt:68.58 Squawk:0501 Task:False PosSys:0 Cat:0 
 |  | Trans:a05087 Sign:GTX508  Origin:United States Time:1710745220 Last:1710745220 Lon:-81.4167 Lat:28.7626 BaroAlt:914.4 Ground:False Vel:80.53 Head:154.25 VertRate:0 Sens:None GeoAlt:906.78 Squawk:None Task:False PosSys:0 Cat:0 
✂️ Disconnected from OpenSky-Network API

Finished!
Board Uptime: 1 hours
Next Update: 30 minutes
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[DJDevon3]

This example also has the base64 encoded string appending with \n which likely will fail for you if the other private example does. I find it really odd and a bit concerning that this works for me but not for you. I'll take another look into this one today too and ensure the \n append is sliced off.

[DJDevon3]

Also added .strip to the end of binascii.b2a_base64(b"" + str(OSN_CREDENTIALS)).strip() which will strip off the \n. still have to use slice but it's 2 less characters to slice off. as far as i know this should be the final version for review.

[DJDevon3]

Double checked the other PR's. This one is ready for review.

[FoamyGuy]

Lets change this one also to use encode() and decode(). There are some diffs in comments in #167 that show the required changes for that.

[FoamyGuy]

Looks good to me. Thank you!