Add Operation Plugin Support for Testing HTTP and Webhooks Requests in Playground

[AceTheCreator]

The Playground is a powerful interactive surface for exploring AsyncAPI specs, but
currently lacks the ability to execute or simulate operations. With the new plugin
architecture now available in the React component, we can expose hooks that allow
tooling to wire in request execution for both HTTP and Webhook channels.

Proposed Behavior

• Users can trigger test requests for subscribe/publish/send/receive operations
  directly from the rendered spec UI.
• The Playground ships with a built-in default plugin that supports:
  • HTTP operations: fires a real HTTP request using the operation's server bindings.
  • Webhook operations: displays the expected incoming payload and optionally
    simulates delivery to a configured endpoint.

Acceptance Criteria

• Playground registers a default HTTP plugin for http protocol bindings
• Playground registers a default Webhook plugin for http-based webhook operations
• Plugin results (response body, status, headers) are rendered inline in the UI
• Errors (network failures, invalid bindings) surface gracefully with user-facing messages
• Existing Playground behavior is unaffected when no plugin is registered

[manik3160]

Hey @AceTheCreator ! opened #1300 for this :)

[aeworxet]

This GitHub issue is submitted for the Microgrant Program calendar-month round 2026-07.

I see this issue was opened on 2026-06-10 (yesterday).

@thulieblack, @derberg - could you please assess whether this issue is ready to be implemented, or does it need a prior discussion?

[KUNDAN1334]

@AceTheCreator can i work on this ?