➕ Add DateTime properties to DecodedMetar and DecodedTaf

[afonsoft]

Feature:

• Add new DateTime properties while keeping existing Day/Time for backward compatibility
• Provide both individual components (Day, Time) and combined DateTime

Changes:

• DecodedMetar: Added ObservationDateTime property
• DecodedTaf: Added OriginDateTime property
• METAR DatetimeChunkDecoder: Populates all three properties
• TAF DatetimeChunkDecoder: Populates all three properties
• Smart DateTime calculation with month/year rollover handling

Benefits:

• Backward compatibility maintained
• Modern DateTime support for new consumers
• Flexible API supporting both old and new patterns

🎯 Enhanced date/time handling with backward compatibility!

All Submissions:

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. Does your submission pass tests?
2. Have you lint your code locally prior to submission?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

[afonsoft]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scanner	Critical	High	Medium	Low	Total (0)
🔚	Open Source Security	0	0	0	0	0 issues

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud