Automatic add the group of satellites

[alex-w]

Added code to automatic add the group of satellites, based on Celestrak groups

Description

I've added code to saving source of TLE into TleData struct and use this data to add new group of satellites as filename of URL. The feature works for Celestrak sources and for newly added satellites only.

Fixes #1636 (issue)

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 change)
• This change requires a documentation update

How Has This Been Tested?

For example satellite "ISS (NAUKA)" included into list of stations (see https://celestrak.com/NORAD/elements/stations.txt). If this satellite already added, then check his groups (he shouldn't contains any group), remove the satellite and update TLE. Find the ISS (NAUKA) and check the group.

Checklist:

• My code follows the code style 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

[github-actions]

Hello @alex-w! Thank you for this enhancement.

[alex-w]

@gzotti If PR is OK then please merge it.