feat: allows passing multiple command names

[wadackel]

The command input parameter allows specifying multiple command names.

# single command
- uses: knowledge-work/command-action@v1
  with:
    command: 'foo'

# multiple command
- uses: knowledge-work/command-action@v1
  with:
    command: 'foo,bar'

# multiple command (multi-line)
- uses: knowledge-work/command-action@v1
  with:
    command: |
      foo,
      bar,

[github-actions]

🎉 This PR is included in version 1.1.0 🎉

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