Add Sonoff S-MATE and R5 switches

[cetygamer]

Fixes #1456

Key notes:

• Sonoff uses custom method of sending an advertisement: by using 0x05 advertisement (Complete list of 32-bit UUIDs) along with the data itself. Added workaround for catching those messages for Sonoff MAC.
• MAC address for all Sonoff devices is the same: 66:55:44:33:22:11 (AFAIK a lot of ESP32 based devices use this default MAC). So instead of MAC I am using 4-byte Device ID (prepending it with 2 zero bytes) to get unique MAC-like identifier for the integration.
• Tested on my S-MATE2. I don't have access to R5 or original S-MATE, so it would be great if someone could test those.

References:

• Sonoff's official eWeLink-Remote Gateway add-on (nodejs app inside the container)
• sonoffR5 Scene Controller Tasmota discussion.

Screenshot:

[cetygamer]

Hi, @Ernst79. Could you please take a look? I tried my best to provide a complete PR with tests and documentation, ready to be merged.

[Ernst79]

Thanks, LGTM. However, two tests seem to fail. Not sure if Altbeacon is using the same UUID?

[Ernst79]

Altbeacon test now fail. We need to check why. They also use 0xFFFF as identifier

[cetygamer]

@Ernst79, should be fixed now. Can you re-ran the tests?

[Ernst79]

Yep, thx. They now pass the test