feat(functions): improve trigger parameter definitions with enums and examples

[binggg]

Description

This PR addresses issue #119 by improving the trigger parameter definitions in the functions tools.

Changes

• Added constant with enum support for trigger types
• Added with detailed examples for timer triggers
• Updated both and tools to use enum validation
• Improved parameter descriptions with cron expression format and examples
• All comments are in English following project standards

Examples

Now users can see clear examples for timer trigger configuration:

• • Execute at 2:00 AM on the 1st of every month
• • Execute at 9:30 AM every day
• • Execute at 12:00 PM every day
• • Execute at midnight on January 1st every year

Testing

• All existing tests pass
• No breaking changes to existing functionality

Closes #119