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.

Commencez par suivre les transports qui appellent McpSchema.deserializeJsonRpcMessage(jsonMapper, string) et examinez comment MCPJsonMapper est fourni. Déterminez comment les transports peuvent accepter des types d’entrée et des schémas Java, puis vérifiez que les entrées des requêtes sont désérialisées en objets Java et que les sorties complexes sont sérialisées sans conversion supplémentaire basée sur Map.