Update codeowners

[ananyahjha93]

What does this PR do?

Add to list of codeowners

Fixes # (issue)

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[codecov]

Codecov Report

Merging #668 (b8d25f4) into master (0e8c0ce) will increase coverage by 26.71%.
The diff coverage is n/a.

❗ Current head b8d25f4 differs from pull request most recent head 9e6da35. Consider uploading reports for the commit 9e6da35 to get more accurate results

@@             Coverage Diff             @@
##           master     #668       +/-   ##
===========================================
+ Coverage   63.30%   90.01%   +26.71%     
===========================================
  Files         185      185               
  Lines        9663     9663               
===========================================
+ Hits         6117     8698     +2581     
+ Misses       3546      965     -2581     

Flag	Coverage Δ
unittests	90.01% <ø> (+26.71%)	⬆️

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

Impacted Files	Coverage Δ
flash/core/utilities/lightning_cli.py	98.57% <0.00%> (+0.95%)	⬆️
flash/core/trainer.py	86.81% <0.00%> (+1.09%)	⬆️
flash/core/data/properties.py	100.00% <0.00%> (+1.31%)	⬆️
flash/core/data/data_pipeline.py	94.38% <0.00%> (+1.32%)	⬆️
flash/core/data/process.py	87.28% <0.00%> (+1.69%)	⬆️
flash/core/data/callback.py	100.00% <0.00%> (+2.66%)	⬆️
flash/image/instance_segmentation/data.py	71.87% <0.00%> (+3.12%)	⬆️
flash/core/data/splits.py	96.66% <0.00%> (+3.33%)	⬆️
flash/image/keypoint_detection/data.py	72.41% <0.00%> (+3.44%)	⬆️
flash/pointcloud/segmentation/open3d_ml/app.py	33.33% <0.00%> (+5.88%)	⬆️
... and 103 more

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[ethanwharris]

LGTM 😃