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

pkg/scraper/cache.go

@@ -36,6 +36,7 @@ type GlobalConfig interface {
 	GetScrapersPath() string
 	GetScraperCDPPath() string
 	GetScraperCertCheck() bool
+	GetPythonPath() string
 }
 
 func isCDPPathHTTP(c GlobalConfig) bool {