add a config value to trust certificates from certain domains

• I agree to release my code and all other changes of this MR under the Apache-2.0 license

Requires rustls.

Example

[trust_certificates]
include = ["*.onion"]

This uses the same include/exclude specification as !54 (merged). As such, it depends on !54 (merged).

It will be marked as a draft until !54 (merged) is merged.