Pull request overview

This PR aims to add axial acceleration calculation to the Flight class, which represents the acceleration along the rocket's longitudinal axis. However, the PR includes several unrelated changes that significantly expand its scope beyond the stated purpose.

Key Changes:

• Added axial_acceleration property to calculate acceleration along rocket's axis
• Added corresponding unit test using dot product verification
• Unexpectedly restored previously deprecated export methods (export_pressures, export_data, export_sensor_data, export_kml) with full implementations

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
rocketpy/simulation/flight.py	Added axial_acceleration cached property; restored export methods that were previously moved to FlightDataExporter; removed self.apogee initialization; added json and simplekml imports; removed deprecated import
tests/unit/simulation/test_flight.py	Added parameterized test to verify axial_acceleration calculation against manual dot product computation at key flight times