#5966 feat: Add Model Context Protocol (MCP) client support

Feature Description

Add Model Context Protocol (MCP) client support to Hoppscotch, similar to Postman's implementation. This would enable users to connect to MCP servers, discover capabilities (tools, prompts, resources), and invoke methods.

Use Case

MCP (Model Context Protocol) is Anthropic's protocol for enabling AI assistants to interact with external tools and data sources. Adding MCP support to Hoppscotch would allow developers to:

Test and debug MCP server implementations
Explore MCP server capabilities interactively
Invoke tools, prompts, and resources with custom arguments
Save MCP requests in collections for reuse
Track MCP invocation history

Proposed Implementation

Transport Support:

HTTP transport with JSON-RPC 2.0 over Server-Sent Events
STDIO transport (requires Hoppscotch Agent or Desktop App)

Authentication:

None (open servers)
Basic Auth
Bearer Token
API Key

Core Features:

Automatic capability discovery
Tool/prompt/resource invocation with JSON argument editor
Real-time event logging
Connection status monitoring
Collections support for saving MCP requests
History tracking for method invocations
Search/filter across capabilities

UI Integration:

New tab in /realtime section alongside WebSocket, SSE, Socket.io, MQTT
Configuration panel for transport and auth settings
Tabbed interface for Tools, Prompts, Resources, Logs, Response
Modal dialogs for collections and history management

Reference

Additional Context

I've already implemented this feature and created PR #5965. Opening this issue for tracking and discussion per the contribution guidelines.