Expose mission state and retain MAVLink ACK evidence

[mbuckton]

What changed

• decode and retain timestamped MISSION_CURRENT sequence, total, state, mission ID, and observation time on DroneTwin
• map MAVLink mission states to explicit active, paused, complete, and related twin values
• preserve the MAVLink 1 fallback when extension fields are absent
• retain the last sent MAVLink message and last related drone response in the terminal MavlinkSendResult
• preserve ACK evidence across an ADVANCE transition so a sequence that subsequently completes does not discard the accepted ACK

Why

The STANAG adapter must reconcile a recovered task from drone evidence and later prove whether the drone acknowledged a command. Previously an accepted ACK advanced the sender, but terminal completion replaced both sentMessage and receivedMessage with null, leaving only an inferred success.

This branch is coordinated with Maps-Messaging/stanag-state-adapter#30.

Validation

• MavlinkEventListSenderTest: 37 of 37 pass, including retained ACK evidence after retry
• mission-current listener tests cover MAVLink 2 fields and MAVLink 1 fallback
• git diff --check passes

The normal Maven build remains blocked before compilation because io.mapsmessaging:dynamic_storage:2.5.3-SNAPSHOT is unavailable from the configured repositories.

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