Add new swat dtype definition

[maxnoe]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 90.97%. Comparing base (0c553fc) to head (65b6a4d).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ctapipe_io_lst/__init__.py	40.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #235      +/-   ##
==========================================
- Coverage   91.09%   90.97%   -0.13%     
==========================================
  Files          25       25              
  Lines        2629     2637       +8     
==========================================
+ Hits         2395     2399       +4     
- Misses        234      238       +4     

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[morcuended]

I also tested it and it works