Add profiles_sample_rate to config file (#679)

Author: ankurk91

config/sentry.php

@@ -77,5 +77,7 @@
 
     // @see: https://docs.sentry.io/platforms/php/guides/laravel/configuration/options/#traces-sample-rate
     'traces_sample_rate' => env('SENTRY_TRACES_SAMPLE_RATE') === null ? null : (float)env('SENTRY_TRACES_SAMPLE_RATE'),
+    
+    'profiles_sample_rate' => env('SENTRY_PROFILES_SAMPLE_RATE') === null ? null : (float)env('SENTRY_PROFILES_SAMPLE_RATE'),
 
 ];