Draft: Quick suspend/resume

Quick suspend/resume

Adds a feature flag --test-quick-suspend-resume which skips the traditional suspend/resume cycle and synchronizes ModemManager with the internal state of always-powered modems with a suspended host.

As discussed in #321 (closed), the synchronization syncs the following parts:

• Signal strength
• Access technologies
• Registration state
• Network time
• SIM lock status
• Full SIM swap
• Operator name
• Roaming state
• Network and cell IDs
• EPS bearer
• Mobile data connection

without affecting the resume time when a call or text is received when the host is suspended.

Fixed issues

• Fixes #321 (closed): Quick resume/suspend
• Fixes #194: Delayed modem detection after resume Quectel EG25 PinePhone