Missing parameter from DeleteUser

[nandor23]

This belongs to gotrue-csharp repository, apologies for the mistake. Closing the issue, a pull request has already been submitted.

Users can be deleted trough the Auth Admin API. The GoTrueAdminClient exposes the DeleteUser method, but the shouldSoftDelete parameter is missing from it. The method signature should be the same as in the JavaScript library: https://github.com/supabase/auth-js/blob/0aa02d15f1c8181dd3c08e4a21b2df17f2943344/src/GoTrueAdminApi.ts#L280

This can be seen in the docs as well: https://supabase.com/docs/reference/javascript/auth-admin-deleteuser

// This is how the method looks like in .NET
Task<bool> DeleteUser(string uid);

I'm happy to open a PR to add this