fix: Improves feedback activity for #186. (#207)

src/transformer/events/mod_feedback/course_module_viewed.php

src/transformer/events/mod_feedback/response_submitted.php

src/transformer/get_event_function_map.php

src/transformer/utils/get_activity/course_feedback.php

..._feedback/course_module_viewed/viewing_feedback/data.json

...feedback/course_module_viewed/viewing_feedback/event.json

...ack/course_module_viewed/viewing_feedback/statements.json

...d_feedback/course_module_viewed/viewing_feedback/test.php

..._feedback/response_submitted/existing_response/event.json