chore: simplify ServiceProvider and externalize multi-endpoint support

- remove "extra.laravel" from composer.json to disable auto-registration
- always boot default Endpoint in ServiceProvider for consistent behavior
- drop request path inspection logic for segmented endpoint resolution

==> apps requiring multiple OData endpoints should now implement and register
   their own ServiceProvider (see docs for example)

Author: mgerzabek

composer.json

@@ -39,9 +39,6 @@
     },
     "extra": {
         "laravel": {
-            "providers": [
-                "Flat3\\Lodata\\ServiceProvider"
-            ],
             "aliases": {
                 "Lodata": "Flat3\\Lodata\\Facades\\Lodata"
             }