[enocean] Add support for Eltako FTKB battery status telegram

[UrsusS]

This request is similar to
[enocean] Add support for Eltako TF-FKB battery status telegram #4578

Eltako FTKB devices provide also the battery states in the status message.
User guide from Eltako

It looks the same as for the TF-FKB, but for EEP: D5-00-01.

Voltage telegram:
ORG = 0x07
Data_byte0 = 0x08
Data_byte1 = 0x00
Battery voltage:
Data_byte2 = 0x00..0xFF equivalent to 0..5 V
Energy storage:
Data_byte3 = 0x00.. 0xFF equivalent to 0..5 V

Therefore I would propose to implement it also similar and call the new EEP D5-00-01_ELTAKO

The data received looks like this:
RADIO_ERP1 with RORG _4BS for 059A0825 payload A5EA011A09059A08250001FFFFFFFF5600 received

[openhab-bot]

This issue has been mentioned on openHAB Community. There might be relevant details there:

https://community.openhab.org/t/eltako-ftkb-received-unknown-rorg/160161/8