Support parameter deserialisation to Java Objects using the MCPJsonMapper

Expected Behavior
Although all the transports provided with the SDK require a jsonMapper they only deserialize inputs as Java maps.
It should be possible to specifiy the Java input types along with the schema so that the transports can deserialize into real Java objects

Same applies for output serialisation. Complex Java types cannot be used directly as output.

Current Behavior

Currently transports use the static method McpSchema.deserializeJsonRpcMessage(jsonMapper, <string>); that cannot be extended and does jsonMapper.readValue(jsonText, MAP_TYPE_REF);

Context

This would greatly simplify applying each request to real java methods with matching parameters. Without that an additional jackson deserialisation is necessary, making the first deserialisation to Map redundant. It's unnecessary code that each implementor must produce.

Beginne damit, die Transporte nachzuverfolgen, die McpSchema.deserializeJsonRpcMessage(jsonMapper, string) aufrufen, und untersuche, wie MCPJsonMapper bereitgestellt wird. Ermittle, wie Transporte Java-Eingabetypen und Schemas akzeptieren können, und verifiziere anschließend, dass Anfrageeingaben in Java-Objekte deserialisiert werden und komplexe Ausgaben ohne zusätzliche Map-basierte Konvertierung serialisiert werden.