New strongly typed provider constructor

[finneg23]

This change adds in a clearer option for constructing a Provider that offers better visibility into initializing the SDK while mostly just facading for the original implementation.

[sanzmauro]

Hi @finneg23,

Thanks for your suggestions. While reviewing your PR, I noticed that the provider wasn’t following the same pattern we implemented in the others, so I took advantage of that along with your feedback and released a new version of the provider (2.1.0) .
This version allows you to inject the client via the constructor, giving you the flexibility to apply custom configurations or adjust the block-until-ready timeout if needed.

Example of how to use it:

var config = new ConfigurationOptions();
var splitClient = new SplitFactory("YOUR_API_KEY", config).Client();

try
{
    splitClient.BlockUntilReady(10000); // wait up to 10 seconds for SDK to be ready
}
catch (Exception ex)
{
    // log & handle
}

await Api.Instance.SetProviderAsync(new Provider(splitClient));

if that works for you, give it a try and let me know your feedback - we can close the PR whenever you feel it's appropriate.

Best regards,
Mauro