helper code to get time sync with minimal fuss on the Fruit Jam.

Refactored and "works for me". I'll ask @b-blake to confirm functionality as well.

	•	Added Network.sync_time() method in network.py
	•	Uses adafruit_ntp + adafruit_connection_manager.
	•	Reads optional NTP_* keys from settings.toml.
	•	Sets rtc.RTC().datetime
	•	Added example examples/fruitjam_time_sync.py (sync once, print localtime).
	•	Added example examples/fruitjam_ntp_settings.toml

ntp and connection_manager libs

blank line missing.

ntp constructor removed.

dup rtc import had already been removed.

new NTP_RETRIES and NTP_DELAY_S user configurable settings.

```
NTP_RETRIES   = 8     # number of NTP fetch attempts
NTP_DELAY_S   = 1.0   # delay between attempts (seconds)
```

updated settings.toml example

updated docstring for sync_time with new NTP* configurables

ruff was getting upset about too many branches

settings.toml example with double quotes for floating point values

mikeysklar attribution

drop duplicate last_exc

Fruit Jam NTP module