getContactFromEmail
Retrieves a contact based on their email address.
This method searches for a contact with the specified email address. The contact can be retrieved from the cache if it's present in the user's roster, designated as a personal contact, or fetched from the server using the fetchContactDataById method.
Return
The IRainbowContact object corresponding to the specified email address, or null if the contact is not found.
Parameters
email
The email address of the contact to retrieve.