Extract entity functionality into traits and interfaces

Co-authored-by: jbtronics <5410681+jbtronics@users.noreply.github.com>

src/Entity/Base/NamedElementTrait.php

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+<?php
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2022 Jan Böhmer (https://github.com/jbtronics)
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published
+ *  by the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+namespace App\Entity\Base;
+
+use Doctrine\DBAL\Types\Types;
+use Doctrine\ORM\Mapping as ORM;
+use Symfony\Component\Serializer\Annotation\Groups;
+use Symfony\Component\Validator\Constraints as Assert;
+
+/**
+ * Trait providing named element functionality.
+ */
+trait NamedElementTrait
+{
+    /**
+     * @var string The name of this element
+     */
+    #[Assert\NotBlank]
+    #[Groups(['simple', 'extended', 'full', 'import', 'api:basic:read', 'api:basic:write'])]
+    #[ORM\Column(type: Types::STRING)]
+    #[Assert\Length(max: 255)]
+    protected string $name = '';
+
+    /**
+     * Get the name of this element.
+     *
+     * @return string the name of this element
+     */
+    public function getName(): string
+    {
+        return $this->name;
+    }
+
+    /**
+     * Change the name of this element.
+     *
+     * @param string $new_name the new name
+     */
+    public function setName(string $new_name): self
+    {
+        $this->name = $new_name;
+
+        return $this;
+    }
+
+    /**
+     * String representation returns the name.
+     */
+    public function __toString(): string
+    {
+        return $this->getName();
+    }
+}