add Dask-proxy

[tlambert03]

lets the dask array returned from to_dask be opened even after the file has been closed (... it will reopen on compute())

[tlambert03]

addresses part of #19
pulled from the proxy I made for aicsimageio

[codecov]

Codecov Report

Merging #22 (80dd178) into main (5e51447) will increase coverage by 0.56%.
The diff coverage is 97.56%.

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
+ Coverage   86.77%   87.34%   +0.56%     
==========================================
  Files          10       11       +1     
  Lines        1066     1106      +40     
==========================================
+ Hits          925      966      +41     
+ Misses        141      140       -1     

Impacted Files	Coverage Δ
src/nd2/_sdk/latest.pyx	84.54% <50.00%> (-0.34%)	⬇️
src/nd2/_dask_proxy.py	100.00% <100.00%> (ø)
src/nd2/nd2file.py	92.79% <100.00%> (+0.91%)	⬆️

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[VolkerH]

nice ! thanks