About the PR

Fixes some issues with working with AsyncApiAny, figuring out the correct types etc.
Added new GetValue type methods for extracting expected values.
These use system.text.json to deserialize to T from the JsonNode type.

Added a static FromExtension method, to remove redundant type casting.
So instead of

if (TryGetValue(key, out IAsyncApiExtension extension))
{
  var myType = (extension as AsyncApiAny).GetValue<MyType>();
}

You do

if (TryGetValue(key, out IAsyncApiExtension extension))
{
  var myType = AsyncApiAny.FromExtensionOrDefault<MyType>(extension);
}

Added new constructor allowing for much simpler AsyncApiAny initialization, utlizing system.json.text to figure out the JsonNode type.

Changelog

• Added: GetValue<T>()
• Added: GetValueOrDefault<T>()
• Added: TryGetValue<T>()
• Added: static FromExtensionOrDefault<T>(IAsyncApiExtension extension)
• Added: new constructor to allow for easier object creation.
• Obsoleted: AsyncApiArray
• Obsoleted: AsyncApiObject