Enable build mapbox android gestures library from source (#8371)

This PR adds a new gradle property to be able to build the
`vendor/mapbox-gestures-android` from source as part of the Maps SDK.
By default it will be `false`.

cc @mapbox/maps-android

GitOrigin-RevId: ef21112ded4f0ae2da52cbf4699194f088b140c6

Author: jush

gradle.properties

@@ -45,6 +45,9 @@ android.useAndroidX=true
 kotlin.code.style=official
 # Internal build flag to build from source.
 buildFromSource=false
+# Internal build flag to build Android Gestures from `vendor/mapbox-gestures-android`.
+buildAndroidGesturesFromSource=false
+
 # Disable ksp incremental feature due to ksp bug in https://github.com/google/ksp/issues/1280
 ksp.incremental=false