chore: use composer scripts in grumphp (#965)

Co-authored-by: Barry vd. Heuvel <[email protected]>

grumphp.yml

@@ -1,25 +1,17 @@
 grumphp:
     tasks:
         phpunit:
-            config_file: ~
-            testsuite: ~
-            group: []
-            always_execute: false
-        phpcs:
-            standard: PSR12
-            warning_severity: ~
-            ignore_patterns:
-                - tests/
+            script: test
             triggered_by: [php]
-            whitelist_patterns:
-                - /^src\/.*/
-                - /^config\/.*/
-        psalm:
-            config: psalm.xml
-            ignore_patterns: []
-            no_cache: false
-            report: null
-            output_format: null
-            threads: null
-            triggered_by: ['php']
-            show_info: false
+            metadata:
+                task: composer_script
+        phpcs:
+            script: check-style
+            triggered_by: [php]
+            metadata:
+                task: composer_script
+        static analysis:
+            script: analyze
+            triggered_by: [php]
+            metadata:
+                task: composer_script