move `connection` to first position, but warn as deprecated when used

[PietrH]

Connection is the final argument, but we decided to move it back to the front to avoid it becoming a breaking change. It should warn as deprecated, and remain unused when in use.

related to #303 and #301

Let's limit this issue to just moving the argument for all functions

• [x] list functions where argument should be moved: let's check everything
• [x] connect_to_etn()
• [x] download_acoustic_dataset()
• [x] get_acoustic_deployments()
• [x] get_acoustic_detections()
• [x] get_acoustic_projects()
• [x] get_acoustic_receivers()
• [x] get_animal_projects()
• [x] get_animals()
• [x] get_cpod_projects()
• [x] get_tags()
• [x] list_acoustic_project_codes()
• [x] list_acoustic_tag_ids()
• [x] list_animal_ids()
• [x] list_animal_project_codes()
• [x] list_cpod_project_codes()
• [x] list_deployment_ids()
• [x] list_receiver_ids()
• [x] list_scientific_names()
• [x] list_station_names()
• [x] list_tag_serial_numbers()
• [x] list_values()
• [x] utils()
• [x] write_dwc()
• [x] devtools::document()
• [x] test