Add support for custom cmake version not available via sdkmanager - Android, Install Missing Android Tools step

Description of the feature request

Android Gradle Plugin supports cmake versions installed outside of Android SDK: https://developer.android.com/studio/projects/add-native-code#vanilla_cmake

install-missing-android-tools step could also support them by installation using brew or apt-get respectively.

More details: https://github.com/bitrise-steplib/steps-install-missing-android-tools/issues/41

Thanks for submitting #feature-request here too, @koral! :slight_smile: