testutil/compose: introduce new and auto commands

[corverroos]

Refactors compose:

• Decouple new from define: new only creates config.json file, define is now identical to lock and run; it only creates docker-compose files.
• This adds support for using existing config files, and generating clusters from them
• Add convenience function compose auto that runs compose define && compose lock && compose run, since this will be the most common use-case.

Result:

compose new --keygen==dkg && compose auto

category: refactor
ticket: #568

[codecov]

Codecov Report

Merging #600 (0a7ae5d) into main (f56ceb3) will decrease coverage by 0.00%.
The diff coverage is 56.00%.

@@            Coverage Diff             @@
##             main     #600      +/-   ##
==========================================
- Coverage   54.68%   54.68%   -0.01%     
==========================================
  Files          95       96       +1     
  Lines        8951     8975      +24     
==========================================
+ Hits         4895     4908      +13     
- Misses       3357     3368      +11     
  Partials      699      699              

Impacted Files	Coverage Δ
testutil/compose/config.go	82.35% <ø> (ø)
testutil/compose/lock.go	58.75% <0.00%> (-3.75%)	⬇️
testutil/compose/run.go	81.08% <0.00%> (ø)
testutil/compose/define.go	46.06% <45.45%> (-1.37%)	⬇️
testutil/compose/new.go	100.00% <100.00%> (ø)
cmd/createdkg.go	0.00% <0.00%> (ø)
core/qbft/qbft.go	82.13% <0.00%> (+0.43%)	⬆️
app/app.go	63.14% <0.00%> (+1.62%)	⬆️

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[dB2510]

LGTM