Improve MongoDB connection pooling and clustering

[anitnilay20]

Description

Enhance MongoDB connection management with advanced pooling and cluster support.

Requirements

• Advanced connection pooling configuration
• Replica set support
• Sharded cluster support
• Read preference configuration
• Connection monitoring and health checks
• Write comprehensive tests

Acceptance Criteria

• Robust connection pooling
• Full replica set support
• Sharded cluster compatibility
• Advanced read preferences

Files to modify

• beatrix_core/src/mongo.rs
• beatrix_core/src/mongo/connection.rs (new file)

Example Usage

let db = MongoDatabase::new("mongodb://host1,host2,host3/mydb?replicaSet=rs0")
    .read_preference(ReadPreference::SecondaryPreferred)
    .max_pool_size(50)
    .connect().await?;