qa: apply Psalm suggestions and create initial baseline

Signed-off-by: Matthew Weier O'Phinney <[email protected]>

Author: weierophinney

.gitignore

@@ -1,4 +1,5 @@
 /.phpcs-cache
+/.phpunit.result.cache
 /clover.xml
 /coveralls-upload.json
 /phpunit.xml

composer.json

@@ -30,7 +30,8 @@
         "laminas/laminas-stdlib": "^2.7.8 || ^3.0.1",
         "phpunit/phpunit": "^9.3",
         "vimeo/psalm": "^4.7",
-        "psalm/plugin-phpunit": "^0.16.0"
+        "psalm/plugin-phpunit": "^0.16.0",
+        "webmozart/assert": "^1.10"
     },
     "autoload": {
         "psr-4": {