Support SJD in ImageNamer

[albireox]

ImageNamer now supports adding an SJD as part of the dirname.

[codecov]

Codecov Report

Merging #26 (f5ba735) into main (a5e45f1) will decrease coverage by 0.39%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
- Coverage   94.14%   93.76%   -0.38%     
==========================================
  Files          21       21              
  Lines        1365     1377      +12     
  Branches      263      265       +2     
==========================================
+ Hits         1285     1291       +6     
- Misses         48       53       +5     
- Partials       32       33       +1     

Impacted Files	Coverage Δ
basecam/models/fits.py	95.84% <ø> (ø)
basecam/exposure.py	89.86% <47.37%> (-3.84%)	⬇️
basecam/actor/commands/expose.py	91.58% <100.00%> (+0.09%)	⬆️

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