keymanager: fixes issues in keymanager API

[xenowits]

Fixes issues related to keymanager API integration:

• Fixes json formatting bug
• Adds --keymanager-auth-token flag to charon dkg. Flag value is redacted when logged
• Adds --keymanager-auth-tokens flag to charon create cluster command
• Fixes keymanager-related tests

category: bug
ticket: #1928

[codecov]

Codecov Report

Patch coverage: 72.91% and project coverage change: +0.07 🎉

Comparison is base (a331020) 55.53% compared to head (c759e2b) 55.60%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1930      +/-   ##
==========================================
+ Coverage   55.53%   55.60%   +0.07%     
==========================================
  Files         174      174              
  Lines       22256    22286      +30     
==========================================
+ Hits        12359    12393      +34     
+ Misses       8322     8317       -5     
- Partials     1575     1576       +1     

Impacted Files	Coverage Δ
cmd/dkg.go	5.26% <0.00%> (-0.15%)	⬇️
dkg/dkg.go	58.75% <69.23%> (+0.31%)	⬆️
eth2util/keymanager/keymanager.go	73.07% <75.00%> (-4.54%)	⬇️
cmd/createcluster.go	59.59% <85.71%> (+0.11%)	⬆️
cmd/cmd.go	81.48% <100.00%> (+0.52%)	⬆️
dkg/disk.go	64.24% <100.00%> (ø)

... and 7 files with indirect coverage changes

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[xenowits]

Successful keymanager import keys with create cluster command:

Error message when lengths don't match with create cluster command:

Successful keymanager import keys with charon dkg command:

[xenowits]

Note that --keymanager-auth-token is redacted in logged parsed config: