Update included licenses iOS and Android

Update "Mapbox GL uses portions of" to "MapLibre Native iOS uses portions of" / "MapLibre Native Android uses portions of"
Rename LICENSE.mbgl-core.md to LICENSES.core.md, these are the licenses of the C/C++ dependencies of the core.
Include licenses of core dependencies in Android and iOS LICENSE.md files.
Run make license-check in platform/android to update versions in Android license.
Remove SQLite blessing from iOS license. SQLite is in the public domain and does not require a license to be included.
Remove license for Optional library (we no longer depend on this library).
Remove Realm license (we no longer use it, it was part of the iOS build process).
Remove mapbox-events-ios license, we no longer use it.

Closes #1520

maplibre / maplibre-native