feat: Add OptionConfiguration to replace Runtime/BuildTime

[bitsandfoxes]

Fixes #1621

Based on the issue description: The aim is to have users no longer need to know or care about Runtime and BuildTime differences. They write their code in once place, we use the same options at any time.

Platform specifics can be controlled via the Unity precompile directives. We include a sample of those with the generated template:

using Sentry;
using Sentry.Unity;

public class SentryConfiguration : SentryOptionsConfiguration
{
    public override void Configure(SentryUnityOptions options)
    {
        // Here you can programmatically modify the Sentry option properties used for the SDK's initialization

#if UNITY_ANDROID || UNITY_IOS
        // Important!
        // On Android and iOS, ALL options configured here will be "baked" into the exported project during
        // build time. Any runtime changes to these options will not take effect.

        // Examples:

        // Works as expected and will disable all debug logging of the native SDKs
        // options.Debug = false;

        // Will NOT work as expected as this will need to get validated at runtime
        // options.Debug = SystemInfo.deviceName.Contains("Pixel");
#endif
    }
}

The Runtime/BuildTime config got deprecated but will still be called last as keep backwards compatibility. I've updated the config window with a warning label.

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