feat(astro): Add Sentry middleware

[Lms24]

This PR adds a Sentry middleware handler for Astro middleware. This handler

• Creates a new span/transaction via startSpan
  • To create a parameterized transaction name, we interpolate the route name from the raw URL and the params object.
• Continues a trace from tracing headers
• Captures an error with Astro SDK-specific handled data
• Optionally allows:
  • setting the client IP from the client request (only in SSR mode)
  • attaching request headers to event.metadata.request

Usage:

// src/middleware.js
import { sequence } from "astro:middleware";
import * as Sentry from "@sentry/astro";

export const onRequest = sequence(
  Sentry.handleRequest(),
  // Add your other handlers after sentryMiddleware
);

This handler is very much inspired by our SvelteKit handle hook handler.

ref #9444