docs: adds bun example

examples/bun/package.json

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+{
+  "devDependencies": {
+    "bun-types": "1.0.14"
+  },
+  "dependencies": {
+    "rian": "^0.3.7"
+  }
+}

examples/bun/server.ts

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+import * as Rian from 'rian/async';
+import { exporter } from 'rian/exporter.otel.http';
+
+Rian.configure('bun-api', {
+	'bun.version': Bun.version,
+});
+
+async function get_data() {
+	return Rian.span('get_data')(async () => {
+		const users = await Rian.span('SELECT * FROM users')(async (s) => {
+			s.set_context({
+				'db.system': 'mysql',
+			});
+
+			await new Promise((resolve) => setTimeout(resolve, 100));
+
+			return [{ user: 'test' }];
+		});
+
+		Rian.currentSpan().set_context({
+			'users.count': users.length,
+		});
+
+		return users;
+	});
+}
+
+const tracer = Rian.tracer('bun-api');
+
+setInterval(() => {
+	Rian.report(
+		exporter((p) =>
+			fetch('http://127.0.0.1:3000', {
+				method: 'POST',
+				body: JSON.stringify(p),
+			}),
+		),
+	);
+}, 1e3);
+
+Bun.serve({
+	port: 8080,
+	async fetch(req: Request) {
+		const u = new URL(req.url);
+
+		return tracer(async () =>
+			Rian.span(`${req.method} ${u.pathname}`)(async (s) => {
+				s.set_context({
+					'http.method': req.method,
+					'http.pathname': u.pathname,
+					'http.scheme': u.protocol.replace(':', ''),
+					'http.host': u.host,
+					'http.port': u.port,
+					'bun.development': this.development,
+				});
+
+				// Routing
+				// -----------------------------------------
+
+				if (u.pathname == '/users') {
+					const users = await get_data();
+					return new Response(JSON.stringify(users));
+				}
+
+				return new Response('', { status: 404 });
+			}),
+		);
+	},
+});

examples/bun/tsconfig.json

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+{
+  "compilerOptions": {
+    "types": ["bun-types"]
+  }
+}