Part-1: Add event definition files for all snowplow events

config/events/cancel_delete_package_version.yml

config/events/cancel_delete_package_versions.yml

config/events/cancel_delete_packages.yml

config/events/checkbox.yml

config/events/click_delete_work_item.yml

config/events/click_toggle_work_item_confidentiality.yml

config/events/delete_package_version.yml

config/events/delete_package_versions.yml

config/events/delete_packages.yml

config/events/nav_hide.yml

config/events/nav_hover_peek.yml

config/events/nav_peek.yml

config/events/nav_show.yml

config/events/request_delete_package_version.yml

config/events/request_delete_package_versions.yml

config/events/request_delete_packages.yml

config/events/request_delete_selected_package_file.yml

config/events/select_issue_type_incident.yml

config/events/set_filter.yml

config/events/submit_packages_cleanup_form.yml