Improve ConfigCollection API with new set(_:to:) method

[ibrahimcetin]

This PR introduces a more intuitive API for setting configuration values in ConfigCollection by adding a new set(_:to:) method with a clearer parameter order.

Motivation

The previous API set(_ string: String, forKey key: String) had an unintuitive parameter order where the value came before the key. The new set(_ key: String, to value: String) method follows a more natural "set key to value" pattern that aligns with common conventions.

Migration

// Before (deprecated)
try repository.config.set("John Doe", forKey: "user.name")

// After
try repository.config.set("user.name", to: "John Doe")