feat: mongodb connector

[sowen1023]

What does this PR do

• 🎯 Add MongoDB connector.
• ✅ Refactor StoredCursorValue, add RawType to support database special types, such as ObjectID of BSON.
• 🧩 Extract CursorStateManager and CursorSerializer from the neo4j connector, unified neo4j and mongodb connector incremental logic.
• 🧩 Extract IncrementalSyncFields.tsx UI component.

Rationale for this change

Standards checklist

• ✅ The PR title is descriptive
• ✅ The commit messages are semantic
• ✅ Necessary tests are added
• ✅ Updated the release notes
• ✅ Necessary documents have been added if this is a new feature

[medcl]

@sowen1023 how about attach some screenshot, or intro video, we may use it somewhere later.

[sowen1023]

[sowen1023]

The source document example:

{
    "_id": {"$oid": "68fe2c6e0d5d38521168ffe0"},
    "author": {
      "name": "John Doe",
      "email": "john@example.com",
      "user_id": "user_001"
    },
    "category": "tutorial",
    "content": "Learn the fundamentals of MongoDB database, including CRUD operations, indexing, and aggregation.",
    "created_at": {"$date": "2024-01-15T10:30:00.000Z"},
    "published": true,
    "status": "processing",
    "summary": "Introduction to MongoDB for beginners",
    "tags": ["mongodb", "database", "nosql"],
    "title": "MongoDB Basics Tutorial",
    "updated_at": {"$date": "2025-10-28T14:30:10.250Z"},
    "url": "https://example.com/mongodb-basics",
    "version": 4,
    "views": 1250
}

The Coco document example:

{
    "id": "68fe2c6e0d5d38521168ffe0",
    "created": "2024-01-15T18:30:00+08:00",
    "updated": "2025-10-28T22:30:10.25+08:00",
    "metadata": {
      "is_published": true
    },
    "payload": {
      "author": {
        "email": "john@example.com",
        "name": "John Doe",
        "user_id": "user_001"
      },
      "status": "processing",
      "version": 4,
      "views": 1250
    },
    "source": {
      "type": "connector",
      "name": "My MongoDB",
      "id": "d3v1rg5afbigjhi7pb70"
    },
    "category": "tutorial",
    "title": "MongoDB Basics Tutorial",
    "summary": "Introduction to MongoDB for beginners",
    "content": "Learn the fundamentals of MongoDB database, including CRUD operations, indexing, and aggregation.",
    "tags": [
      "mongodb",
      "database",
      "nosql"
    ],
    "url": "https://example.com/mongodb-basics",
    "last_updated_by": {
      "timestamp": "2025-10-28T22:30:10.25+08:00"
    }
}

[sowen1023]

I noticed the ID Hash was not being utilized, and have since implemented the necessary fix.

The Coco document example:

{
    "_index": "coco_document-v2",
    "_type": "_doc",
    "_id": "99fb3175a8a0c0cfc60a0aeac471bf62",
    "_score": 1,
    "_source": {
        "id": "99fb3175a8a0c0cfc60a0aeac471bf62",
        "created": "2024-01-15T18:30:00+08:00",
        "updated": "2025-10-30T21:58:52.993+08:00",
        "metadata": {
            "is_published": true
        },
        "payload": {
            "author": {
                "email": "john@example.com",
                "name": "John Doe",
                "user_id": "user_001"
            },
            "status": "processing",
            "version": 4,
            "views": 1250
        },
        "source": {
            "type": "connector",
            "name": "My MongoDB",
            "id": "d3v1rg5afbigjhi7pb70"
        },
        "category": "tutorial",
        "title": "MongoDB Basics Tutorial",
        "summary": "Introduction to MongoDB for beginners",
        "content": "Learn the fundamentals of MongoDB database, including CRUD operations, indexing, and aggregation.",
        "tags": [
            "mongodb",
            "database",
            "nosql"
        ],
        "url": "https://example.com/mongodb-basics",
        "last_updated_by": {
            "timestamp": "2025-10-30T21:58:52.993+08:00"
        }
    }
}