Provider loop discovery almost finished

Provider lookup will lookup on startup, do the healthcheck until the
stream starts and also restart on stream closure or provider stall

Docs/Provider_Discovery.md

@@ -0,0 +1,31 @@
+# Provider Discovery
+```
+NewControlPanel()
+       ↓
+go telemService.FindProvider() - has a callback for onFind
+       |
+       |iterates over the known providers
+       |
+     onFind
+       ↓
+telemService.SwitchProvider() - activates the found provider
+       |
+       |-→ Create a background job while the stream hasn't initiated to listened
+       |   for data, otherwise the connection might die before we start streaming
+       |                                 ↓
+       |                     go telemService.ProviderMonitor()
+       ↓                     |                              |           
+  /-→waits--\    if the provider stops we        this healthcheck is stopped 
+  \_________/    we clear the provider and       once the stream starts
+                 go back to the                   
+                             ↓
+                       FindProvider()
+```
+The provider discovery routine starts on `tui/tui.go`.
+`FindProvider` is called here and it starts a background job.
+On successful discovery the background job calls the `SwitchProvider` method
+and dies.
+
+## Provider stalls
+A provider stalls once there is no new data.
+After stalling