[AfrahGh]

Description

Closes #355

This PR makes the chief/RSO initial attitude and spin configurable in the RSO inspection environment while preserving the existing nadir-pointing behavior as the default.

The changes include:

• Adds hill_frame_attitude, a reusable utility for generating an initially Hill-aligned attitude and body rate.
• Adds RSO attitude and angular-rate observations:
  • rso_sigma_BH: RSO body attitude relative to its Hill frame, represented as MRPs.
  • rso_omega_BH: RSO body angular velocity relative to its Hill frame, expressed in Hill-frame coordinates.
• Updates the RSO inspection example to demonstrate how spin_config is set and bound to the satellite argument randomizer.
• Documents the feature in the release notes.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How should this pull request be reviewed?

• By commit
• All changes at once

How Has This Been Tested?

• Added tests/unittest/utils/test_attitude.py to test default nadir pointing, configurable spin rates and axes, and invalid configurations.
• Updated tests/unittest/obs/test_relative_observations.py to test rso_sigma_BH and rso_omega_BH.
• Updated tests/integration/test_int_rso_env.py to verify the new RSO observations are present, finite, and correctly shaped.

All tests pass.

Future Work

No additional work is required

Checklist

• I have performed a self-review of my code
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation and release notes
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works

[LorenzzoQM]

Looks good!