[communication] Remove the TargetSender class, and use a command based system

settings.toml

src/polystar/communication/board_a.py

src/polystar/communication/command.py

src/polystar/communication/cs_link_abc.py

src/polystar/communication/file_descriptor_target_sender.py

src/polystar/communication/print_target_sender.py

src/polystar/communication/screen.py

src/polystar/communication/target_sender_abc.py

src/polystar/communication/uart_target_sender.py

src/polystar/communication/usb_target_sender.py

src/polystar/dependency_injection.py

src/polystar/target_pipeline/target_abc.py

src/polystar/target_pipeline/target_pipeline.py

src/research/scripts/send_fake_targets.py

...tests/common/unittests/communication/test_board_a_uart.py