Add export-data task

[leszko]

Add export-data task.

Related studio PR: livepeer/studio#1775

[codecov]

Codecov Report

Merging #202 (ff61f10) into main (9b58f73) will decrease coverage by 0.24639%.
The diff coverage is 0.00000%.

@@                 Coverage Diff                 @@
##                main        #202         +/-   ##
===================================================
- Coverage   15.03631%   14.78992%   -0.24639%     
===================================================
  Files             18          19          +1     
  Lines           2341        2380         +39     
===================================================
  Hits             352         352                 
- Misses          1964        2003         +39     
  Partials          25          25                 

Impacted Files	Coverage Δ
task/export-data.go	0.00000% <0.00000%> (ø)
task/export.go	0.00000% <0.00000%> (ø)
task/runner.go	21.88139% <ø> (ø)

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Impacted Files	Coverage Δ
task/export-data.go	0.00000% <0.00000%> (ø)
task/export.go	0.00000% <0.00000%> (ø)
task/runner.go	21.88139% <ø> (ø)

[victorges]

LGTM, only need to revert the EncryptedKey change (check comment)