[DataAvailability] Implement oneshot execution data requester

[illia-malachyn]

Closes #7202

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.55172% with 3 lines in your changes missing coverage. Please review.

Project coverage is 41.10%. Comparing base (0075514) to head (98dfd88).

Files with missing lines	Patch %	Lines
...tion/requester/oneshot_execution_data_requester.go	96.55%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7329      +/-   ##
==========================================
- Coverage   42.75%   41.10%   -1.66%     
==========================================
  Files        1591     2208     +617     
  Lines      146192   193639   +47447     
==========================================
+ Hits        62507    79588   +17081     
- Misses      78345   107441   +29096     
- Partials     5340     6610    +1270     

Flag	Coverage Δ
unittests	41.10% <96.55%> (-1.66%)	⬇️

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[illia-malachyn]

@peterargue What do you think of this approach? I'm reusing the written code from the previous requester. The test makes sure we download execution data for every block successfully. As the requester's functions are reused, it might be everything we need for now. We can add more tests after integration with the pipeline

[Guitarheroua]

@illia-malachyn could you, please, review my changes to your PR

[Guitarheroua]

Looks good!