Add EnMAP HSI L1B reader

[zxdawn]

• Tests added
• Fully documented

This PR supports reading the EnMAP L1B ZIP file provided by DLR. This reader relied on enpt to read variables from TIFF and METADATA files in the zip file.

[codecov]

Codecov Report

Merging #2590 (2f6b366) into main (95eb01a) will decrease coverage by 0.16%.
Report is 155 commits behind head on main.
The diff coverage is 11.22%.

❗ Current head 2f6b366 differs from pull request most recent head cd6cf1e. Consider uploading reports for the commit cd6cf1e to get more accurate results

@@            Coverage Diff             @@
##             main    #2590      +/-   ##
==========================================
- Coverage   94.91%   94.76%   -0.16%     
==========================================
  Files         351      353       +2     
  Lines       51215    51323     +108     
==========================================
+ Hits        48611    48635      +24     
- Misses       2604     2688      +84     

Flag	Coverage Δ
behaviourtests	4.26% <0.00%> (-0.03%)	⬇️
unittests	95.38% <11.22%> (-0.14%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
satpy/readers/hsi_l1b.py	11.22% <11.22%> (ø)

... and 15 files with indirect coverage changes

[coveralls]

Pull Request Test Coverage Report for Build 6433889494

• 11 of 98 (11.22%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 95.331%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
satpy/readers/hsi_l1b.py	11	98	11.22%

Totals
Change from base Build 6426189025:	-0.2%
Covered Lines:	48758
Relevant Lines:	51146

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💛 - Coveralls