feat: plugin configuration improvements

[mfiedorowicz]

• configure diode target and disallow its override via NetBox UI with PLUGINS_CONFIG, e.g.:

PLUGINS_CONFIG = {
    "netbox_diode_plugin": {
        "diode_target": "grpc://localhost:8080/diode", # The Diode gRPC target for communication with Diode server, default: "grpc://localhost:8080/diode"
        "disallow_diode_target_override": True, # Disallow the Diode target to be overridden by the user, default: False
    }
}

• during initial migration, load secrets for diode related API keys from mounted paths under /run/secrets/*, with a fallback to environment variables and eventually generate keys in-flight

[github-actions]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
1433	1419	99%	0%	🟢

New Files

File	Coverage	Status
netbox_diode_plugin/tests/test_forms.py	100%	🟢
TOTAL	100%	🟢

Modified Files

File	Coverage	Status
netbox_diode_plugin/forms.py	100%	🟢
netbox_diode_plugin/tests/test_views.py	100%	🟢
netbox_diode_plugin/views.py	99%	🟢
TOTAL	100%	🟢

updated for commit: 1f33485 by action🐍

[leoparente]

Well done! LGTM

[orb-ci]

🎉 This PR is included in version 0.5.0 🎉

The release is available on GitHub release

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