feat(core): implement a CLI with @oclif to replace commander

[faustbrian]

Proposed changes

Resolves #1582
Resolves https://github.com/ArkEcosystem/core/milestone/5

Types of changes

• New feature (non-breaking change which adds functionality)
• Refactoring (improve a current implementation without adding a new feature or fixing a bug)

Checklist

• I have read the CONTRIBUTING documentation
• Lint and unit tests pass locally with my changes

[ghost]

@air1one @supaiku0 - please review this in the next few days. Be sure to explicitly select labels so I know what's going on.

If no reviewer appears after a week, a reminder will be sent out.

[ghost]

@faustbrian The ci/circleci: test-node11-1 job is failing as of 8a0e83e3911006452b1a556e41eb9d63f617322c. Please review the logs for more information.

Once you've pushed the fixes, the build will automatically re-run. Thanks!

[codecov-io]

Codecov Report

Merging #2100 into develop will increase coverage by 0.46%.
The diff coverage is 84.09%.

@@             Coverage Diff             @@
##           develop    #2100      +/-   ##
===========================================
+ Coverage    78.92%   79.39%   +0.46%     
===========================================
  Files          330      329       -1     
  Lines         7973     7920      -53     
  Branches      1138     1132       -6     
===========================================
- Hits          6293     6288       -5     
+ Misses        1648     1599      -49     
- Partials        32       33       +1

Impacted Files	Coverage Δ
...s/core-container/src/config/loaders/file-loader.ts	67.56% <ø> (ø)	⬆️
packages/core-p2p/src/monitor.ts	54.48% <100%> (+0.86%)	⬆️
packages/core-p2p/src/peer-verifier.ts	86.79% <100%> (-1.82%)	⬇️
packages/core-container/src/environment.ts	82.75% <57.14%> (ø)	⬆️
packages/core-p2p/src/peer.ts	88.34% <75%> (+0.11%)	⬆️
packages/core-container/src/registrars/plugin.ts	80.95% <75%> (+0.7%)	⬆️
packages/core-container/src/container.ts	51.72% <88.88%> (+2.94%)	⬆️
packages/core-p2p/src/errors.ts	90.9% <90.9%> (ø)
... and 1 more

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[vasild]

After this change it is no longer possible to override CORE_DB_USERNAME from the environment:

$ export CORE_DB_USERNAME=core
$ yarn --cwd packages/core relay:devnet
...
error: role "ark" does not exist

Is this intended?