Add BLE proxy area to configuration page.

**Is your feature request related to a problem? Please describe.**
I have a large number of BLE Proxy devices and starting to use naming convention "BLE Proxy XXXXXX" where XXXXXX is the last 6 of the MAC address of the esp32 device. Each is assigned an area in HA, however it's difficult to track this through the config flow of the Bermuda integration

**Describe the solution you'd like**
Add area name for proxy to "Configure Bermuda" so it's clear which proxy is where.

**Describe alternatives you've considered**
I do have some older devices named with the room name, but this made standardizing the ESPHome config super messy and in many cases the hostname was longer than 32 characters

Example below of where 'area' column could be added: