feat: introduce multi select for tools input

[hjlarry]

Checklist:

Important

Please review the checklist below before submitting your pull request.

• Please open an issue before creating a PR or link to an existing issue
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

Description

before	after

changes

1. Added multi-select input type:

   • Improves user experience by allowing selection from predefined options
   • Eliminates need for manual text input, reducing potential errors
   • Simplifies development by removing need for input validation and string-to-array conversion

2. Modified output format of Firecrawl crawl/scrape tool, to the new multi-select input type

3. Removed validate_parameters method from BuiltinToolProviderController. This method was redundant as it duplicated functionality in the base class ToolProviderController

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update, included: Dify Document
• Improvement, including but not limited to code refactoring, performance optimization, and UI/UX improvement
• Dependency upgrade

Testing Instructions

test locally

• multi-select of form in a workflow app
• multi-select of llm in a workflow app
• multi-select of form in an agent app
• multi-select of llm in an agent app