feat: command prompt for zephyr log

[ert78gb]

closes: #2812

It works with the bundled firmware. Shell command to test the function is uhk connections

[kareltucek]

Works fine by me.

One a bit distracting thing is those prompts that are inserted even in the middle of a command, e.g.:

2026-03-23 17:22:09 | UHK 80 right | Executing following command from usb in UhkShell: 'uhk connections'
Connection info:
----------------------
Compiled peripheral count: 3
Configured peripheral count: 3
Pairing mode: 2
2026-03-23 17:22:09 | UHK 80 right | Directed advertising enabled: 1
New connection: 1
Known host connection ble addresses:
- 0 'Usb'
- 1 'Dongle I': address: E0:AE:78:DA:59:E3 (random)
- 2 'Dongle II': address: EA:5A:B8:F6:43:75 (random)
- 3 'Dongle III': address: CC:E7:0C:EA:75:FC (public)
2026-03-23 17:22:10 | UHK 80 right | - 4 'Dongle IV': address: FF:0B:38:20:85:09 (random)
- 5 'Moto': address: D4:5E:89:65:A3:F8 (public)
- 6 'Tux': address: 98:5F:41:D2:92:3A (public)
- 7 'Unregistered Ble': address: D2:14:BB:8D:AA:13 (random)
- 22 'Unregistered Ble': address: 00:00:00:00:00:00 (public)
2026-03-23 17:22:10 | UHK 80 right | - 23 'USB Device (Backup)'
All bonds:
- D2:14:BB:8D:AA:13 (random)
- 98:5F:41:D2:92:3A (public)
- FB:70:3D:95:CB:A6 (random)
- D4:5E:89:65:A3:F8 (public)
2026-03-23 17:22:10 | UHK 80 right | Current connections:
- peer 1(left (n/a, fb:70:3d:95:cb:a6)), connection 29
- peer 3(host1 (Moto, d4:5e:89:65:a3:f8)), connection 6
- n/a (n/a, ff:ff:ff:ff:ff:ff)
----------------------

Not sure what to do with them though.

• Maybe show them only if the device is different from the one that produced the last log, or the time since last "log" is higher than 5 seconds?
• Or include them after every newline.

Anyways, this is good enough for me.