Adds RSSI sensor, and fixes battery reporting

[legrego]

Introduces a new RSSI diagnostic sensor, and fixes battery state reporting.

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
combustion
__init__.py	25	2	92%	51–52
binary_sensor.py	44	16	63%	31, 35, 43–44, 54–59, 63, 68, 73, 78–79, 84
bluetooth_listener.py	34	13	61%	46–49, 51–54, 56–58, 60–61
config_flow.py	47	10	78%	18, 40, 46–49, 106–108, 114
const.py	12	0	100%
entity.py	7	2	71%	14–15
probe_manager.py	33	10	69%	40–43, 45, 47–49, 55, 59
sensor.py	135	62	54%	77, 82–83, 85–86, 88, 91, 95–96, 98, 105–107, 117–122, 126, 131, 136, 141–143, 148, 155–159, 163, 168–170, 175, 182–184, 189, 194, 201–202, 207, 212–213, 218–219, 228–229, 234, 239–240, 245–246, 255–256, 261, 266–267, 272–273
combustion/combustion_ble
__init__.py	0	0	100%
advertising_data.py	32	2	93%	33, 38
battery_status_virtual_sensors.py	75	15	80%	27, 31, 45, 49–50, 64, 68–69, 86–87, 92–93, 98–99, 122
combustion_probe_data.py	68	24	64%	45, 51, 56–58, 63, 68, 73, 81, 86–90, 95–98, 100, 105–108, 110
hop_count.py	15	1	93%	25
mode_id.py	49	1	97%	72
probe_temperatures.py	21	0	100%
TOTAL	597	158	73%

Tests	Skipped	Failures	Errors	Time
2	0 :zzz:	0 :x:	0 :fire:	1.043s :stopwatch: