[MNG-8285] Implement mvnenc, new CLI tool for password management

[jira-importer]

Tamas Cservenak opened MNG-8285 and commented

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Issue Links:

• MNG-8283 Maven CLIng, the "new gen" CLI
  ("requires")

Remote Links:

• GitHub Pull Request #1793
  

Backported to: 4.0.0-beta-5