Simple static location sharing (#19754)

Adds static location share a la [MSC3488](https://github.com/matrix-org/matrix-doc/pull/3488) behind a labs flag, supporting legacy `m.location` `msgtype` too.  Powered by https://github.com/matrix-org/matrix-react-sdk/pull/7135.  Adds maplibre as a dependency.

To make this work, you have to add a valid `map_style_url` to your config.json.

test/jest-mocks.js

@@ -12,3 +12,6 @@ Object.defineProperty(window, 'matchMedia', {
         dispatchEvent: jest.fn(),
     })),
 });
+
+// maplibre requires a createObjectURL mock
+global.URL.createObjectURL = jest.fn();