Add 'Test with ...' command for component to select test commands from available in devfile

`odo test` allows to specify test command to run for component using `--test-command ` in addition to supports running default test (covered in this issue #1974). There should be the way to list available test commands (see odo issue [#4449](https://github.com/openshift/odo/issues/4449) using `odo test list` sub-command or similar to avoid parsing of component's devfile.