Gabrielalao/fence 1339 upgrade flutter sdk to latest ios and android radar sdk

[gabrielalao]

• Bump iOS version from 3.5.9 to 3.8.9
• Bump android version from 3.5.9 to 3.8.12
• remove setAdIdEnabled
• rename sendEvent to logConversion and add revenue param
• add trackVerified
• add trackVerifiedToken
• add isUsingRemoteTrackingOptions
• update autocompleteQuery with param add expandUnits
• add validateAddress
• add App Attest to ios example
• add Play Integrity API to android example
• update example project

[gabrielalao]

@tjulien fixed all please review again

[tjulien]

Looks good - except MIGRATION.MD is empty - can you copy the content from here: https://github.com/radarlabs/radar-sdk-ios/blob/master/MIGRATION.md#36x-to-370. except translate the code to flutter?

[gabrielalao]

@tjulien I updated migration.md I thought I pushed the commit.