Python path setting (#2409)

* Add python package
* Add python path backend config
* Add python path to system settings page
* Apply python path to script scrapers and plugins

internal/api/resolver_query_configuration.go

@@ -120,6 +120,7 @@ func makeConfigGeneralResult() *models.ConfigGeneralResult {
 		ScraperCertCheck:             config.GetScraperCertCheck(),
 		ScraperCDPPath:               &scraperCDPPath,
 		StashBoxes:                   config.GetStashBoxes(),
+		PythonPath:                   config.GetPythonPath(),
 	}
 }