feat: read bip38 from env

[spkjp]

Proposed changes

Passing the bip38 password by parameter is now deprecated... Instead the forger now reads
the env variables ARK_FORGER_BIP38 and ARK_FORGER_PASSWORD.

See also ArkEcosystemArchive/core-commander#74

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (improve a current implementation without adding a new feature or fixing a bug)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Build (changes that affect the build system)
• Docs (documentation only changes)
• Test (adding missing tests or fixing existing tests)
• Other... Please describe:

Checklist

• I have read the CONTRIBUTING documentation
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[codecov-io]

Codecov Report

Merging #1224 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1224   +/-   ##
========================================
  Coverage    78.55%   78.55%           
========================================
  Files          416      416           
  Lines         6968     6968           
  Branches       925      925           
========================================
  Hits          5474     5474           
  Misses        1319     1319           
  Partials       175      175

Impacted Files	Coverage Δ
packages/core/lib/start-forger.js	0% <ø> (ø)	⬆️

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