Introduce provider interfaces for labels, descriptions and aliases

Author: Benestar

src/Term/AliasesProvider.php

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+<?php
+
+namespace Wikibase\DataModel\Term;
+
+/**
+ * @since 4.0
+ *
+ * @licence GNU GPL v2+
+ * @author Bene* < benestar.wikimedia@gmail.com >
+ */
+interface AliasesProvider {
+
+	/**
+	 * @return AliasGroupList
+	 */
+	public function getAliases();
+
+}

src/Term/DescriptionsProvider.php

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+<?php
+
+namespace Wikibase\DataModel\Term;
+
+/**
+ * @since 4.0
+ *
+ * @licence GNU GPL v2+
+ * @author Bene* < benestar.wikimedia@gmail.com >
+ */
+interface DescriptionsProvider {
+
+	/**
+	 * @return TermList
+	 */
+	public function getDescriptions();
+
+}

src/Term/LabelsProvider.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Wikibase\DataModel\Term;
+
+/**
+ * @since 4.0
+ *
+ * @licence GNU GPL v2+
+ * @author Bene* < benestar.wikimedia@gmail.com >
+ */
+interface LabelsProvider {
+
+	/**
+	 * @return TermList
+	 */
+	public function getLabels();
+
+}