Added support for Laravel 7 custom casts (#913)

* added support for laravel 7 custom casts

* refactored tests; added test cases

* added test case

* resolved method dublication

tests/Console/ModelsCommand/migrations/____custom_casts_table.php

@@ -0,0 +1,20 @@
+<?php declare(strict_types=1);
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CustomCastsTable extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('custom_casts', static function (Blueprint $table) {
+            $table->string('casted_property_with_return_type');
+            $table->string('casted_property_with_return_docblock');
+            $table->string('casted_property_with_return_primitive');
+            $table->string('casted_property_with_return_primitive_docblock');
+            $table->string('casted_property_with_return_nullable_primitive');
+            $table->string('casted_property_without_return');
+        });
+    }
+}