ref: add ext-excimer as composer suggestion (#2057)

Author: Litarnus

composer.json

@@ -47,6 +47,7 @@
         "spiral/roadrunner-worker": "^3.6"
     },
     "suggest": {
+        "ext-excimer": "Enable Sentry profiling with the Excimer PHP extension.",
         "monolog/monolog": "Allow sending log messages to Sentry by using the included Monolog handler."
     },
     "conflict": {