add PhoneLinker, and the ability to add a phone number to the account during setup

[dyc3]

• add proto for IPhoneService
• add PhoneClient
• add PhoneLinker
• fix lints and such
• add comments
• update phone linker
• use phonenumber crate for phone linker
• adjust errors for account linker
• update setup command to be able to add phone numbers
• adjust logging in the setup command
• update account linker