Performance optimization when using `GenericClient`

[prochnowc]

Describe the bug

The GenericClient serializes reponse body's (which is already parsed JsonElement) to string and then parses them again via KubernetesJson.Deserialize<>.

Adding a new overload to KubernetesJson.Deserialize<> which accepts JsonElement and replacing the response.Body.ToString() calls with (JsonElement)response.Body would eliminate the need to deserialize the body twice.

Kubernetes C# SDK Client Version
11.0.21

Server Kubernetes Version
1.25.9

Dotnet Runtime Version
net6.0