Add doctor command (#1259)

* feat: doctor command

* doctor: use console.warn for quickshell feature logs

* doctor: show compositor, quickshell and cli path in verbose

* doctor: show useful env variables

* doctor: indicate if config files are readonly

* doctor: add power-profiles-daemon and i2c

* doctor: cleanup code

* doctor: fix icon theme env variable

* doctor: use builtin config/cache dir functions

* doctor: refactor to use DoctorStatus struct and 'enum'

* doctor: use network backend detector

core/cmd/dms/commands_common.go

@@ -513,5 +513,6 @@ func getCommonCommands() []*cobra.Command {
 		notifyActionCmd,
 		matugenCmd,
 		clipboardCmd,
+		doctorCmd,
 	}
 }