[Chore] Introduce psalm (#962)

* chore: introduce psalm

* chore: remove dead code

* chore: run psalm workflow

* chore: run psalm in grumphp

* normalize composer.json

* chore: analyse --> analyze

* chore: just remove psalm when running tests instead of worrying about dependency mismatch hell

Co-authored-by: mr-feek <[email protected]>

grumphp.yml

@@ -16,3 +16,12 @@ parameters:
             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