add param type date and date-picker

[zyqzyq]

Description

Fixes langgenius/dify#36162

tool plugin add type date and date-picker

Type of Change

• Bug fix
• New feature
• Refactor
• Performance improvement
• Other

Essential Checklist

Testing

• I have tested the changes locally and confirmed they work as expected
• I have added unit tests where necessary and they pass successfully

Bug Fix (if applicable)

• I have used GitHub syntax to close the related issue (e.g., Fixes #123 or Closes #123)

Additional Information

Please provide any additional context that would help reviewers understand the changes.

[gemini-code-assist]

Code Review

This pull request introduces DATE and DATE_PICKER as new tool parameter types and updates the validation logic. The review feedback points out that the existing ToolParameter struct cannot enforce date range constraints due to its float64 fields and lacks format validation for default values. Additionally, it is suggested to evaluate if both types are necessary to avoid redundancy.

[gemini-code-assist]

The addition of the DATE type highlights a limitation in the ToolParameter struct (line 128), where Min and Max are defined as *float64. These fields cannot be used to enforce date range constraints. Additionally, there is currently no validation for the Default value to ensure it follows a specific format (e.g., ISO 8601). Consider updating the validation logic to support these requirements for date-related types.

[gemini-code-assist]

Consider whether both DATE and DATE_PICKER are necessary as distinct types. If they both represent a date string and the difference is purely a UI hint, it might be more maintainable to have a single DATE type. This avoids redundancy in the type system and simplifies the logic for consumers of these parameters.