feat(overlays drawer): initialised overlays drawer and displayed public overlays

Closes MIN-190

Description

In this PR I introduced drawer for overlays and displayed public overlays. No other functionality was involved - just displaying the data in the drawer.

src/components/FunctionalArea/TopBar/TopBar.component.test.tsx

@@ -41,4 +41,16 @@ describe('TopBar - component', () => {
     expect(isOpen).toBe(true);
     expect(drawerName).toBe('submaps');
   });
+
+  it('should open overlays drawer on overlays button click', () => {
+    const { store } = renderComponent({ drawer: initialStateFixture });
+
+    const button = screen.getByRole('button', { name: 'Overlays' });
+    button.click();
+
+    const { isOpen, drawerName } = store.getState().drawer;
+
+    expect(isOpen).toBe(true);
+    expect(drawerName).toBe('overlays');
+  });
 });