Support hooks in MultiProvider

[PenguinDan]

Currently, hooks are not supported in the MultiProvider implementation. See

kotlin-sdk/kotlin-sdk/src/commonMain/kotlin/dev/openfeature/kotlin/sdk/multiprovider/MultiProvider.kt

Line 42 in af65a59

// TODO: Support hooks

Add support for Hooks according to the specifications outlined in https://openfeature.dev/specification/appendix-a/#hooks

We can refer to the Javascript implementation