deposit: marshal array of deposits

[xenowits]

• Add tests for testing MarshalDepositDatas.
• The deposit data created by the likes of staking-deposit-cli consist of an array of deposit datas, one for each validator. For us, it means one for each DV.
• It also contains an additional field, the deposit_cli_version.
• Adds code to generate and test a deposit data file that can be used in og launchpad.
• Modify createcluster to use the updated MarshalDepositData function.

category: feature
ticket: #554

[codecov]

Codecov Report

Merging #557 (32c5bfd) into main (5d482b5) will increase coverage by 0.19%.
The diff coverage is 86.84%.

@@            Coverage Diff             @@
##             main     #557      +/-   ##
==========================================
+ Coverage   54.99%   55.19%   +0.19%     
==========================================
  Files          91       91              
  Lines        8631     8622       -9     
==========================================
+ Hits         4747     4759      +12     
+ Misses       3247     3229      -18     
+ Partials      637      634       -3     

Impacted Files	Coverage Δ
eth2util/deposit/deposit.go	58.55% <85.71%> (+8.97%)	⬆️
cmd/createcluster.go	55.49% <90.00%> (+0.92%)	⬆️
core/qbft/qbft.go	81.04% <0.00%> (-1.53%)	⬇️
app/app.go	66.27% <0.00%> (+2.95%)	⬆️

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[dB2510]

LGTM