OCR tutorial using Forte Ontologies to store data

[hepengfe]

This PR fixes #867.

Description of changes

Implement a notebook tutorial for OCR to show forte's capability on managing related data such as images containing text and recognized text, texts' bounding boxes and their relations.

Possible influences of this PR.

Describe what are the possible side-effects of the code change.

Test Conducted

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[codecov]

Codecov Report

Merging #877 (ad469d6) into master (64fade1) will decrease coverage by 0.01%.
The diff coverage is 46.15%.

@@            Coverage Diff             @@
##           master     #877      +/-   ##
==========================================
- Coverage   80.86%   80.85%   -0.02%     
==========================================
  Files         254      254              
  Lines       19434    19444      +10     
==========================================
+ Hits        15715    15721       +6     
- Misses       3719     3723       +4     

Impacted Files	Coverage Δ
forte/data/ontology/top.py	77.87% <33.33%> (-0.36%)	⬇️
ft/onto/base_ontology.py	95.52% <75.00%> (-0.32%)	⬇️

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