Create tables for `phone` and `ad_to_phone`

[CurtLH]

After new records are loaded into the table backpage, the process should follow the following steps for each records:

1. For each phone number found in the ad...
2. Check if the phone number is in the phone table
3. If the phone number is not found in the phone, add it to the phone table
4. Take the phond_id from the phone table, and the ad_id from the ad table, and insert a new record into the ad_to_phone table