Read staged contracts from CSV file

[SupunS]

Closes onflow/cadence#3050

[codecov-commenter]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (e77011b) 56.36% compared to head (e0e03e0) 56.38%.

Files	Patch %	Lines
...il/ledger/migrations/staged_contracts_migration.go	85.00%	4 Missing and 2 partials ⚠️
...execution-state-extract/execution_state_extract.go	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@                    Coverage Diff                     @@
##           feature/stable-cadence    #5425      +/-   ##
==========================================================
+ Coverage                   56.36%   56.38%   +0.01%     
==========================================================
  Files                        1030     1030              
  Lines                      100004   100049      +45     
==========================================================
+ Hits                        56371    56412      +41     
- Misses                      39377    39380       +3     
- Partials                     4256     4257       +1     

Flag	Coverage Δ
unittests	56.38% <81.25%> (+0.01%)	⬆️

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[turbolent]

Nice!

[janezpodhostnik]

How are new line characters handled in the contract code? It looks like there shouldn't be any.

[turbolent]

@janezpodhostnik I'm fairly sure Go's CSV reader supports newlines (escaped; similar to e.g. also commas and quotes), but we can add a test case if needed

[SupunS]

multiline codes can be within quotes: 3778fcd. AFAIK, all CSV writers automatically quote (and escape existing quotes), if string content is multi-lined.

[SupunS]

The failing test TestGossipSubIHaveBrokenPromises_Above_Threshold seems intermittent, and passes locally. It is also not related to the changes here, so will go head and merge the PR.