📝 DOC: Improve Annotation Store Documentation + Fix Bug

[John-P]

Changes

• Change docstring examples to use concrete classes.
• Add custom warning when attempting to instantiate the abstract base class.
• Replace occurrences of store.add with store.append in examples.
• Fix bug with DictionaryStore.bquery and geometry=None, i.e. only a where predicate given.

Documentation

The live build is at https://tia-toolbox.readthedocs.io/en/docs-ann-store-eg/
Annotation storage module: https://tia-toolbox.readthedocs.io/en/docs-ann-store-eg/_autosummary/tiatoolbox.annotation.storage.html#module-tiatoolbox.annotation.storage

[codecov]

Codecov Report

Merging #565 (a619427) into develop (adf42f5) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head a619427 differs from pull request most recent head 7336038. Consider uploading reports for the commit 7336038 to get more accurate results

@@           Coverage Diff            @@
##           develop     #565   +/-   ##
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  Coverage    99.51%   99.51%           
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  Files           62       62           
  Lines         6590     6594    +4     
  Branches      1077     1078    +1     
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+ Hits          6558     6562    +4     
  Misses          20       20           
  Partials        12       12           

Impacted Files	Coverage Δ
tiatoolbox/annotation/storage.py	99.61% <100.00%> (+<0.01%)	⬆️

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[shaneahmed]

Thanks @John-P
All good. Just a minor suggestion which you can commit online.