Separate layers - Application + Project (#5293)

* Application interface

* Application describe

* Application list

* Fix --output/-o flag

* Test Run()

* Tests on application pkg

* Unit tests on kclient relative to application

* comment

* Add ComponentList method to Application

* Project interface

* Project CLI tests

* Dharmit review

scripts/mockgen.sh

@@ -26,3 +26,11 @@ mockgen -source=pkg/devfile/image/image.go \
 mockgen -source=pkg/odo/cmdline/cmdline.go \
     -package cmdline \
     -destination pkg/odo/cmdline/mock.go
+
+mockgen -source=pkg/application/application.go \
+    -package application \
+    -destination pkg/application/mock.go
+
+mockgen -source=pkg/project/project.go \
+    -package project \
+    -destination pkg/project/mock.go