fix(model-loading): keep track of open GRPC Clients (#3377)

Due to a previous refactor we moved the client constructor tight to the
model address, however that was just a string which we would use to
build the client each time.

With this change we make the loader to return a *Model which carries a
constructor for the client and stores the client on the first
connection.

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

pkg/model/process.go

@@ -33,7 +33,7 @@ func (ml *ModelLoader) StopAllExcept(s string) error {
 func (ml *ModelLoader) deleteProcess(s string) error {
 	if _, exists := ml.grpcProcesses[s]; exists {
 		if err := ml.grpcProcesses[s].Stop(); err != nil {
-			return err
+			log.Error().Err(err).Msgf("(deleteProcess) error while deleting grpc process %s", s)
 		}
 	}
 	delete(ml.grpcProcesses, s)