cmd: create dkg cli to support partial deposits

[pinebit]

Added --deposit-amounts flag to create dkg command. DKG procedure itself does not respect the partial amounts yet.
This PR only introduces the flag, validation with a bug fix, plus refactoring of writing deposit datas to avoid code duplication.

category: feature
ticket: #2888

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (3237887) 53.57% compared to head (6221766) 53.66%.

Files	Patch %	Lines
eth2util/deposit/deposit.go	76.31%	6 Missing and 3 partials ⚠️
cmd/createcluster.go	0.00%	0 Missing and 1 partial ⚠️
dkg/dkg.go	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2887      +/-   ##
==========================================
+ Coverage   53.57%   53.66%   +0.09%     
==========================================
  Files         200      200              
  Lines       28122    28131       +9     
==========================================
+ Hits        15065    15096      +31     
+ Misses      11190    11173      -17     
+ Partials     1867     1862       -5     

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[sonarcloud]

Quality Gate passed

Issues
1 New issue

Measures
0 Security Hotspots
No data about Coverage
0.9% Duplication on New Code

See analysis details on SonarCloud

[dB2510]

All depositDatas amounts shall have equal values.
I think it should say All depositDatas amounts should sum up to 32 ETH., right? It is not mandatory to have equal values.

[pinebit]

Not in this case. This function writes the single deposit file for a node. In case of partial deposits this function is called multiple times per each partial amount x each node. The input slice here is the input for the single file. All amounts shall be equal.