🆕 Use Annotations as a Filter for Patch Extraction

[measty]

This PR is something i've been thinking about from a conversation with Daan when he was here from Radboud doing a seminar a while back. His comment was that one thing some of his colleges felt was missing in TIAtoolbox was ability to get patches filtered by class/label.

Its not that hard to set up tiatoolbox patch extractor to allow this, which is what i've added in this PR.

it allows you to provide a path to an annotation store as the mask. By default the mask will then be built out of all the annotations, but you can also provide any filter that works in the annotation store, and have only those annotations make the mask. So for example, if you have some pathologist annotations with some regions, and you only want to extract patches which have some overlap with regions labelled 'tumor' or whatever, you would just have to provide the appropriate string ("props['label'] == 'tumor'" for example).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.89%. Comparing base (14f1215) to head (b007dc2).

Additional details and impacted files

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##           develop     #822   +/-   ##
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  Coverage    99.89%   99.89%           
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  Files           69       69           
  Lines         8650     8658    +8     
  Branches      1653     1654    +1     
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+ Hits          8641     8649    +8     
  Misses           1        1           
  Partials         8        8           

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