refactor: replace underscores with dashes

[xenowits]

• Replaces cluster_lock.json and cluster_definition.json with cluster-lock.json and cluster-definition.json respectively.
• Change output text of charon create cluster to indicate that cluster-lock.json files are generated instead of manifest.json.

category: refactor
ticket: #588

[codecov]

Codecov Report

Merging #594 (2c70498) into main (7eea302) will increase coverage by 0.46%.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##             main     #594      +/-   ##
==========================================
+ Coverage   54.21%   54.67%   +0.46%     
==========================================
  Files          95       95              
  Lines        8922     8921       -1     
==========================================
+ Hits         4837     4878      +41     
+ Misses       3386     3342      -44     
- Partials      699      701       +2     

Impacted Files	Coverage Δ
cmd/createdkg.go	0.00% <0.00%> (ø)
cmd/dkg.go	0.00% <0.00%> (ø)
cmd/createcluster.go	50.93% <50.00%> (+0.19%)	⬆️
app/app.go	59.89% <0.00%> (-1.90%)	⬇️
core/qbft/qbft.go	82.57% <0.00%> (+10.45%)	⬆️

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