Tap on locations in timeline to see a larger map

Show a fully-featured MapView, centered on the dropped pin,
which allows panning/zooming. Share button allows opening
in a map application.

Supports showing a description at the top of the screen,
if one is supplied with the event.

Out of scope: showing the local user's location (being
done as a separate story).

Includes some minor tidying: remove duplicate Location,
and make GeoURI parsing a method on that class; fix the
pointer location in MapView (I broke it earlier, whoops!)

features/location/api/build.gradle.kts

@@ -17,6 +17,7 @@
 plugins {
     id("io.element.android-compose-library")
     alias(libs.plugins.ksp)
+    id("kotlin-parcelize")
 }
 
 android {