Phone numbers should be optional

[tlater-famedly]

Currently, phone numbers are mandatory, however it appears that this is was not the intended design.

[tlater-famedly]

Implementation in #13

I realized I never clarified if phone numbers should be optional at a configuration or at an individual-entry level, hence I'm opening this issue to track that.

Currently #13 implements it assuming it should be optional at a configuration level. This means that we will still refuse to sync entries without phone numbers if the tool has a phone attribute set, and never sync phone numbers if it there is no phone attribute.

[nikzen]

Implementation in #13

I realized I never clarified if phone numbers should be optional at a configuration or at an individual-entry level, hence I'm opening this issue to track that.

Currently #13 implements it assuming it should be optional at a configuration level. This means that we will still refuse to sync entries without phone numbers if the tool has a phone attribute set, and never sync phone numbers if it there is no phone attribute.

The tool should always sync the entry. If there is a phone number, it should include the number if not, it should sync what is there