add support for .connectignore

• specifying files to ignore via the --exclude option makes for very long command line arguments
• the exclude patterns do not work consistently, see #320
• our current globbing implementation is a bit limited
• the meaning of extra_files is not easy to reason about across app modes, see #354

❯ rsconnect deploy voila
Usage: rsconnect deploy voila [OPTIONS] PATH [EXTRA_FILES]...

❯ rsconnect deploy notebook
Usage: rsconnect deploy notebook [OPTIONS] FILE [EXTRA_FILES]...

❯ rsconnect deploy streamlit
Usage: rsconnect deploy streamlit [OPTIONS] DIRECTORY [EXTRA_FILES]...

Introducing a .connectignore would make it simpler to document which files should be ignored by a deployment.
pathspec looks like an appealing candidate for enhanced wildcard support.

Inizia con l’implementazione del globbing in rsconnect/models.py intorno alla riga 158, quindi segui i percorsi dei comandi deploy voila, notebook e streamlit e la gestione di --exclude e EXTRA_FILES. Esamina python-pathspec come implementazione proposta dei caratteri jolly. Il lavoro è completo quando .connectignore è supportato e il comportamento di esclusione è coerente tra le modalità dell’app elencate.