Improve pattern curation and add regex checking to resolver

[cthoyt]

This should have been obvious since the patterns are available for most. Regex checking isn't strictly necessary if the id mapping is loaded, but can provide more information to users. It can also help catch cases where we would want to make an identifiers.org URL but there's no id->name mapping available already

Possible cases to handle:

• some namespaces don't have patterns but do have identifiers... should warn me as the developer to get curating (pattern and sample ID should go in the metaregistry)
• some namespaces have a pattern written in the metaregistry (ensure there's a sample ID)
• Add optional field in metaregistry for decoy identifiers
• some namespaces have a pattern just in MIRIAM

See also:

• https://github.com/manubot/manubot/blob/master/manubot/cite/tests/test_citekey_api.py
• https://github.com/manubot/manubot/blob/master/manubot/cite/tests/test_citekey.py

[cthoyt]

throwback before we made bioregistry ^