feat: cron expression static generator

[Yangeok]

Describe the Feature Request

A clear and concise description of what the feature does.

• Generating 2 way: random and static
  • Can be catched an error in compilation time with typescript feature
  • Using below operators:
    • ?
    • /
    • ,
    • -
    • L
    • W
    • #
    • Abbreviations (e.g. WEB, DEC etc.)

Describe the Use Case

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Describe Preferred Solution

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Describe Alternatives

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Additional Information

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