Feature: Implement Pipeline Interceptor System (Middleware)

Goal

Implement a middleware/interceptor system for Neo.data.Pipeline to allow cross-cutting concerns to be handled declaratively.

Description

As the Data Pipeline architecture matures, we need a way to inject logic at key stages of the data lifecycle (pre-request, post-response, post-parse).

Requirements:

1. Support request interceptors (e.g., adding Auth headers, logging params).
2. Support response interceptors (e.g., global error handling, refreshing tokens).
3. Interceptors must support async execution.
4. Allow global interceptors to be registered at the Neo.worker.Data level.
5. Pipelines should allow instance-specific interceptors that merge with globals.