[FEATURE] Add Paste JSON Schema Functionality to Custom Tools

[AsharibAli]

Problem Statement

Currently, when creating custom tools in Flowise, users need to manually add each property to the Input Schema one by one using the "Add Item" button. This process becomes tedious and time-consuming when dealing with multiple properties or when copying existing schemas from other sources.

Current Workflow

1. Click "Add Item" button
2. Fill in property details manually:
   • Property name
   • Type
   • Description
   • Required status
3. Repeat for each property needed

Proposed Solution

Add a "Paste JSON" feature that allows users to:

1. Paste a complete JSON schema at once
2. Convert it automatically to the grid format