Motivation
e.g. usethis ignore <dir>. This is convenient in many cases where a directory is not to be analysed for whatever reason.

In addition, we should add individual option for each tool as a standard option --ignore <dir>. For example,

usethis tool ruff --ignore <dir> --ignore <other-dir>.

Not sure how easy it would be in typer to allow the same option to be repeated but we can look into it.

Summary of desired enhancement
Provide an interface to ignore directories for all managed tooling which runs analysis.