feat: create profiling package + rewrite profiling tutorial

internal/bench/testdata/proxies/basic-auth.yml

@@ -0,0 +1,20 @@
+proxy:
+  from: ["*"]
+  to: ""
+  layers:
+    basic-auth:
+      type: authn-basic
+      enabled: true
+      options:
+        users:
+          - username: foo
+            passwordHash: "$2y$10$ShTc856wMB8PCxyr46qJRO8z06MpV4UejAVRDJ/bixhu0XTGn7Giy"
+            attributes:
+              email: foo@bar.com
+        rules:
+          - set_header("Remote-User-Attr-Email", user.attrs.email)
+fetch:
+  url:
+    user:
+      username: foo
+      password: bar

internal/bench/testdata/proxies/noop.yml

@@ -0,0 +1,3 @@
+proxy:
+  from: ["*"]
+  to: ""

internal/bench/testdata/proxies/rewriter.yml

@@ -0,0 +1,12 @@
+proxy:
+  from: ["*"]
+  to: ""
+  layers:
+    host-rewriter:
+      type: rewriter
+      enabled: true
+      options:
+        rules:
+          request:
+            - set_host(request.url.host)
+            - set_header("X-Proxied-With", "bouncer")