A new static method `BuildStaticClient(Action<HttpClient> configureClient)`
was added to the `ReC.Client` namespace in `ReCClient.cs`. This method
configures and builds a static `IServiceProvider` for creating `ReCClient`
instances. It includes XML documentation detailing its purpose, usage,
and parameters, and warns that it should only be called once during
application startup.
The method accepts an `Action<HttpClient>` parameter for `HttpClient`
configuration and throws an `InvalidOperationException` if the static
provider is already built. It is marked `[Obsolete]` to encourage the
use of a local service collection instead of the static provider.
Additionally, the XML documentation for the `ReCClient` creation method
was updated to reference the new `BuildStaticClient` method.
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