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.

首先跟踪调用 McpSchema.deserializeJsonRpcMessage(jsonMapper, string) 的传输，并检查 MCPJsonMapper 是如何提供的。确定传输如何接受 Java 输入类型和 schema，然后验证请求输入是否反序列化为 Java 对象，以及复杂输出是否无需额外的基于 Map 的转换即可序列化。