🎨 ENH: Move WSIReader and WSIMeta import to top-level

[shaneahmed]

• Move WSIReader and WSIMeta import to top-level

This allows importing WSIReader and WSIMeta from wsicore. Improves usage of the library by importing modules as from tiatoolbox.wsicore import WSIReader and from tiatoolbox.wsicore import WSIMeta

[codecov]

Codecov Report

Merging #560 (43a5074) into develop (54b9e22) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 43a5074 differs from pull request most recent head 2cf341d. Consider uploading reports for the commit 2cf341d to get more accurate results

@@           Coverage Diff            @@
##           develop     #560   +/-   ##
========================================
  Coverage    99.51%   99.51%           
========================================
  Files           63       63           
  Lines         6591     6593    +2     
  Branches      1077     1077           
========================================
+ Hits          6559     6561    +2     
  Misses          20       20           
  Partials        12       12           

Impacted Files	Coverage Δ
tiatoolbox/wsicore/__init__.py	100.00% <100.00%> (ø)

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