Add tasks to max project across channels or z-slices

[tddough98]

• Add two tasks MaxProjectFiducial and MaxProjectBits
  • MaxProjectFiducial allows using all z-slices of fiducial beads when available instead of having to select a single z-slice where some fiducial beads may be out of focus.
  • MaxProjectBits can simulate a polyT channel from all the available bits for use in WatershedSegment
• Update WatershedSegment and FiducialCorrelationWarp to access max projected images from these tasks when they are included in downstream tasks' parameters.

Mixed in are a handful of miscellaneous improvements like

• Move SimpleTasks into the tests folder as they're only used in tests and not part of the public API
• add docstrings and type annotations to modified functions
• Drop a few unused or redundant functions like get_image_dimensions and get_microns_per_pixel
• Renames some verbose variable names such as frame_number --> frame

[codecov]

Codecov Report

Patch coverage: 89.49% and project coverage change: +0.14% 🎉

Comparison is base (eb09577) 87.76% compared to head (500630e) 87.90%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
+ Coverage   87.76%   87.90%   +0.14%     
==========================================
  Files          57       59       +2     
  Lines        5060     5186     +126     
==========================================
+ Hits         4441     4559     +118     
- Misses        619      627       +8     

Files Changed	Coverage Δ
merlin/analysis/generatemosaic.py	71.73% <0.00%> (ø)
merlin/analysis/optimize.py	75.27% <ø> (ø)
merlin/merlin.py	75.49% <ø> (ø)
test/simple_tasks.py	78.33% <ø> (ø)
test/test_snakemake.py	100.00% <ø> (ø)
merlin/data/dataorganization.py	84.56% <57.14%> (-1.46%)	⬇️
merlin/analysis/globalalign.py	68.62% <60.00%> (ø)
merlin/analysis/warp.py	83.33% <76.19%> (+1.14%)	⬆️
merlin/util/imagereader.py	66.48% <78.94%> (+0.71%)	⬆️
merlin/analysis/maxproject.py	90.47% <90.47%> (ø)
... and 7 more

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