Add stubs for elastic_apm extension

Author: stchr

Diff for: PhpStormStubsMap.php

@@ -408,6 +408,21 @@ final class PhpStormStubsMap
   'Ds\\Set' => 'ds/ds.php',
   'Ds\\Stack' => 'ds/ds.php',
   'Ds\\Vector' => 'ds/ds.php',
+  'Elastic\\Apm\\CustomErrorData' => 'elastic_apm/elastic_apm.php',
+  'Elastic\\Apm\\DistributedTracingData' => 'elastic_apm/elastic_apm.php',
+  'Elastic\\Apm\\ElasticApm' => 'elastic_apm/elastic_apm.php',
+  'Elastic\\Apm\\ExecutionSegmentContextInterface' => 'elastic_apm/elastic_apm.php',
+  'Elastic\\Apm\\ExecutionSegmentInterface' => 'elastic_apm/elastic_apm.php',
+  'Elastic\\Apm\\SpanContextDbInterface' => 'elastic_apm/elastic_apm.php',
+  'Elastic\\Apm\\SpanContextDestinationInterface' => 'elastic_apm/elastic_apm.php',
+  'Elastic\\Apm\\SpanContextHttpInterface' => 'elastic_apm/elastic_apm.php',
+  'Elastic\\Apm\\SpanContextInterface' => 'elastic_apm/elastic_apm.php',
+  'Elastic\\Apm\\SpanInterface' => 'elastic_apm/elastic_apm.php',
+  'Elastic\\Apm\\TransactionBuilderInterface' => 'elastic_apm/elastic_apm.php',
+  'Elastic\\Apm\\TransactionContextInterface' => 'elastic_apm/elastic_apm.php',
+  'Elastic\\Apm\\TransactionContextRequestInterface' => 'elastic_apm/elastic_apm.php',
+  'Elastic\\Apm\\TransactionContextRequestUrlInterface' => 'elastic_apm/elastic_apm.php',
+  'Elastic\\Apm\\TransactionInterface' => 'elastic_apm/elastic_apm.php',
   'EmptyIterator' => 'SPL/SPL.php',
   'EnchantBroker' => 'enchant/enchant.php',
   'EnchantDictionary' => 'enchant/enchant.php',