Add Ellipse annotation type

[vinnamkim]

Summary

• Related issue: https://jira.devtools.intel.com/browse/CVS-102621
• Add Ellipse annotation type and update relevant other components who need to support Ellipse annotation type.

How to test

I updated the existing tests related to this change.

Checklist

• I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below)

# Copyright (C) 2021 Intel Corporation
#
# SPDX-License-Identifier: MIT

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Codecov Report

Base: 77.60% // Head: 77.67% // Increases project coverage by +0.07% 🎉

Coverage data is based on head (6376b13) compared to base (3cc2e1c).
Patch coverage: 93.57% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #807      +/-   ##
===========================================
+ Coverage    77.60%   77.67%   +0.07%     
===========================================
  Files          179      179              
  Lines        23238    23335      +97     
  Branches      5023     5032       +9     
===========================================
+ Hits         18034    18126      +92     
- Misses        4141     4146       +5     
  Partials      1063     1063              

Flag	Coverage Δ
macos-11_Python-3.10	?
macos-11_Python-3.7	77.16% <93.00%> (+0.06%)	⬆️
macos-11_Python-3.8	77.54% <93.57%> (+0.07%)	⬆️
macos-11_Python-3.9	77.55% <93.57%> (+0.06%)	⬆️
ubuntu-20.04_Python-3.10	77.60% <93.57%> (+0.07%)	⬆️
ubuntu-20.04_Python-3.7	77.17% <93.00%> (+0.06%)	⬆️
ubuntu-20.04_Python-3.8	77.55% <93.57%> (+0.07%)	⬆️
ubuntu-20.04_Python-3.9	77.56% <93.57%> (+0.07%)	⬆️
windows-2019_Python-3.10	77.54% <93.51%> (+0.07%)	⬆️
windows-2019_Python-3.7	77.11% <92.92%> (+0.06%)	⬆️
windows-2019_Python-3.8	77.48% <93.51%> (+0.07%)	⬆️
windows-2019_Python-3.9	77.49% <93.51%> (+0.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
datumaro/plugins/transforms.py	76.72% <75.00%> (+0.03%)	⬆️
datumaro/components/visualizer.py	93.39% <87.50%> (+0.25%)	⬆️
datumaro/components/annotation.py	91.50% <91.80%> (+<0.01%)	⬆️
datumaro/__init__.py	100.00% <100.00%> (ø)
datumaro/components/filter.py	92.27% <100.00%> (+0.51%)	⬆️
datumaro/components/operations.py	84.07% <100.00%> (+0.06%)	⬆️
datumaro/plugins/data_formats/coco/exporter.py	86.17% <100.00%> (+0.08%)	⬆️
datumaro/plugins/data_formats/datumaro/base.py	93.61% <100.00%> (+0.09%)	⬆️
datumaro/plugins/data_formats/datumaro/exporter.py	92.95% <100.00%> (+0.13%)	⬆️
datumaro/plugins/validators.py	90.89% <100.00%> (ø)
... and 2 more

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[bonhunko]

It looks fine to me. I just left some minor comments.

[sooahleex]

It looks good to me.