feat: DEV-72: Add option for per task or per annotation export

[triklozoid]

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (518b99a) 75.62% compared to head (f8b7b6a) 75.79%. Report is 260 commits behind head on master.

:exclamation: Current head f8b7b6a differs from pull request most recent head db039ba. Consider uploading reports for the commit db039ba to get more accurate results

Files	Patch %	Lines
label_studio/io_storages/redis/models.py	0.00%	1 Missing :warning:
label_studio/io_storages/s3/models.py	50.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1767      +/-   ##
==========================================
+ Coverage   75.62%   75.79%   +0.16%     
==========================================
  Files         127      127              
  Lines        9153     9155       +2     
==========================================
+ Hits         6922     6939      +17     
+ Misses       2231     2216      -15     

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