Benchmark and optimize class lookups

When https://github.com/mapbox/mapbox-base-android/issues/14 is closed, we can look into running benchmarks on release builds and measuring the impact of reflection class lookups. https://developer.android.com/jetpack/androidx/releases/benchmark looks like a good tool that we can use.

Optimization ideas, TBD:

• potentially, kotlinf-reflect is able to cut down invoke calls and class lookup times. We'd need to evaluate binary size increase vs performance improvements if those are confirmed
• for all other clients that are not building from source but consuming the pre-built binary instead, we could hardcode the glue classes paths and avoid the reflection overhead

まず前提となる issue #14 と AndroidX Benchmark のドキュメントを確認します。release ビルドをベンチマークして reflection によるクラス検索のパフォーマンスを測定し、その後、kotlin-reflect と hardcoded glue-class パスにおけるバイナリサイズとパフォーマンスのトレードオフを評価します。完了条件は、各代替案について測定結果と最適化の方向性が文書化されていることです。