Cron Utilities: Parse, Lint, Simplify

[niteshpurohit]

Feature Request

Description

Add convenience methods for validating, simplifying, and linting cron expressions.

Use Case

Developers need feedback and safer defaults when authoring schedules.

Proposed Solution

• Implement:
  • RailsCrons.valid?(expr) -> true/false
  • RailsCrons.simplify(expr) -> string (e.g., "@daily")
  • RailsCrons.lint(expr) -> Array<String> for warnings/errors (e.g., step out of range).
• Use fugit as the underlying parser for robustness.
• Provide helpful messages and examples in errors.

Alternatives Considered

Homegrown parser — rejected to reduce maintenance.

Additional Context

Ensure compatibility with standard 5-field cron and predefined macros like @daily, @weekly.

Checklist

• I have searched for a similar feature request and didn't find any duplicates.
• I have included all the required information.
• I have tagged the issue with the label "enhancement".