feat: deep link API

# Why

To integrate with the OTel GPT, it would be necessary that OTelBin
exposes an API to create deep links.

# What

Add an API under `POST /deep-link` that takes a collector config
within the request body and that outputs a deep link within the
`Location` response header and within the body (`text/plain` body).

packages/otelbin/src/app/deep-link/route.tsx

@@ -0,0 +1,39 @@
+// SPDX-FileCopyrightText: 2024 Dash0 Inc.
+// SPDX-License-Identifier: Apache-2.0
+
+import { type NextRequest, NextResponse } from "next/server";
+import { serializeUrlState } from "~/lib/urlState/serializeUrlState";
+import { editorBinding } from "~/components/monaco-editor/editorBinding";
+
+export const runtime = "edge";
+
+export function OPTIONS(request: NextRequest): NextResponse {
+	return new NextResponse(null, {
+		status: 200,
+		headers: getCorsHeaders(request),
+	});
+}
+
+export async function POST(request: NextRequest): Promise<NextResponse> {
+	const body = await request.text();
+	const emptyParams = new URLSearchParams();
+	const pathName = serializeUrlState([editorBinding], "/", emptyParams, emptyParams, {
+		[editorBinding.name]: body,
+	});
+	const url = new URL(pathName, request.nextUrl).toString();
+	return new NextResponse(url, {
+		status: 200,
+		headers: {
+			...getCorsHeaders(request),
+			Location: url,
+		},
+	});
+}
+
+function getCorsHeaders(request: NextRequest) {
+	return {
+		"Access-Control-Allow-Origin": request.headers.get("Origin") || "*",
+		"Access-Control-Allow-Methods": "POST, OPTIONS",
+		"Access-Control-Allow-Headers": "Content-Type",
+	};
+}