refactor: move components from /drawing/inline to /drawing

- they will be used for other positioning element (floating)

src/file/drawing/extent/extent-attributes.ts

@@ -0,0 +1,13 @@
+import { XmlAttributeComponent } from "file/xml-components";
+
+export interface IExtentAttributes {
+    cx?: number;
+    cy?: number;
+}
+
+export class ExtentAttributes extends XmlAttributeComponent<IExtentAttributes> {
+    protected xmlKeys = {
+        cx: "cx",
+        cy: "cy",
+    };
+}