Mission support

[kashish2210]

I have added mission support. I have added one extra data field of Chandra for some metadata, but we can use axaf as the mission

Here I have tried a test case with verbose = true so that we can use each test separately, but I will move to this "test_suit" as keeping track with @fjebaker ;)

I have added more detailed synthetic data in the test suite
@matteobachetti, your review is required.

For a more detailed analysis with the fits data of different missions, manual test cases with a custom logging system, I consider visiting this notebook

NOTE: this is the sub-branch of #47 please review this commit leave rest

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.43505% with 78 lines in your changes missing coverage. Please review.

Project coverage is 88.22%. Comparing base (cddac34) to head (c1d4faa).
Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lightcurve.jl	72.54%	42 Missing ⚠️
src/missionSupport.jl	58.18%	23 Missing ⚠️
src/events.jl	89.43%	13 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (cddac34) and HEAD (c1d4faa). Click for more details.

HEAD has 5 uploads less than BASE

Flag	BASE (cddac34)	HEAD (c1d4faa)
	6	1

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
- Coverage   95.24%   88.22%   -7.03%     
==========================================
  Files           3        6       +3     
  Lines         505      849     +344     
==========================================
+ Hits          481      749     +268     
- Misses         24      100      +76     

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