Fixed mutually exclusive fields in the configuration + made class abstract

Author: sebprt

composer.json

@@ -16,10 +16,10 @@
         "ext-json": "*",
         "nikic/php-parser": "^4.10",
         "symfony/config": "^5.2",
-        "php-etl/fast-map-config": "^0.3.0@dev",
-        "php-etl/configurator-contracts": "^0.4.0@dev",
-        "php-etl/packaging-contracts": "^0.1.0@dev",
-        "php-etl/satellite-toolbox": "^0.2.0@dev"
+        "php-etl/fast-map-config": "^0.3.0",
+        "php-etl/configurator-contracts": "^0.4.0",
+        "php-etl/packaging-contracts": "^0.1.1",
+        "php-etl/satellite-toolbox": "^0.2.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.0",