Is your feature request related to a problem? Please describe.
The spec for extensions defines 3 types of extensions, the last one is: "Method Extensions (Extended Skills): Adding entirely new RPC methods beyond the core set defined by the protocol"
As far as I understand, there is currently no way for enhancing my A2AStarletteApplication/A2AFastAPIApplication application with new RPC methods. (as they both extends JSONRPCApplication and it uses a fixed list of the core RPC methods that cant be extended)
Describe the solution you'd like
I would like JSONRPCApplication to allow its users to hook new JSON-RPC methods.
Describe alternatives you've considered
I'm considering using the HTTP/REST protocol instead of the JSON-RPC protocol just because its easier to extend with new methods.
Additional context
No response
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