MAINT: Meta header for propagators

[jklenzing]

Description

Adds orbital info used for propagation to global metadata values. If Keplerian elements are used in generation, then only those elements (including default values) are added. If TLEs are used, only those default values are used.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Loading an instrument and inspecting for header data.

Checklist:

• Make sure you are merging into the develop (not main) branch
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• Add a note to CHANGELOG.md, summarizing the changes
• Update zenodo.json file for new code contributors

If this is a release PR, replace the first item of the above checklist with the
release checklist on the pysat wiki:
https://github.com/pysat/pysat/wiki/Checklist-for-Release