0.5.0

Add "initFitPositions" in "AMapFlutter".
Add "fitPositions" field in "MapInitConfig".
Use "_AMapApiCodec" as "creationParamsCodec" when creating "AndroidView" and "UiKitView".
When map initializing completed, move camera to fit positions in Android and iOS.
Recover "Position" custom type.
Add "EdgePadding" utility and expose utilities.
Remove the deprecated option 'android.enableR8'.
Upgrade android gradle plugin and compileSdk.