Create MAG L1A CDF file formats

[maxinelasp]

Summary

Create Xarray files detailing the formatting and naming inside the 6 MAG L1A CDF output files.

Requirements

The more specific the better.

• [ ] Match the MAG algorithm document specifications
• [x] Align with SPDF formatting rules as closely as possible

Related tickets

107

[maxinelasp]

Worked in in PR #340 and #404, should be completed soon as I got all the info I need from MAG and SPDF