tame verbose outputs in map_query_to_causal_type() (and possibly elsewhere)

[gerasy1987]

Some functions have non-mutable verbose output. This is particularly an issue with internal functions. An example is CausalQueries:::map_query_to_causal_type(), which calls to expand_wildcard(). The latter has a verbose argument, but the former does not. As a result, when calling CausalQueries:::map_query_to_causal_type(), we cannot prevent the printout.

Happy to fix some of those as I go through the tests.