:zap: Avoid Decoding Entire TIFF Before Conversion

[John-P]

• Swap to using tifffile .aszarr instead of .asarray, where possible, to avoid decoding the entire image to disk before conversion.
  • Currently falls back to .asarray if the axis order is not YXS.
• Refactor thumbnail to use get_tile instead of __getitem__ where possible. I future this could allow more advanced and faster downsampling methods e.g. downsampling via partial tile decoding.
• Added a fallback to __getitem__ if get_tile is not implemented.
• Adds dask as a dependency to handle viewing zarr array with different axes ordering.
  • Broke reading from subprocesses and required creating a special local client object.

[codecov[bot]]

Codecov Report

Merging #48 (6bfd552) into dev (960623c) will decrease coverage by 0.09%. The diff coverage is 91.92%.

@@            Coverage Diff             @@
##              dev      #48      +/-   ##
==========================================
- Coverage   90.69%   90.61%   -0.09%     
==========================================
  Files          13       14       +1     
  Lines        1752     1843      +91     
==========================================
+ Hits         1589     1670      +81     
- Misses        163      173      +10     

Impacted Files	Coverage Δ
wsic/writers.py	86.79% <85.71%> (+0.03%)	:arrow_up:
wsic/readers.py	86.06% <89.33%> (-2.66%)	:arrow_down:
wsic/tile_iterators.py	93.03% <93.03%> (ø)
wsic/multiproc.py	70.00% <100.00%> (+2.14%)	:arrow_up:

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