standardize tool metadata by adding annotation classes to sdk

Expected Behavior

It would be ideal to have Tool annotation classes (specifically Tool/ToolParam) be added to the mcp-java-sdk.

Current Behavior

Multiple, tool-specific annotations exist, the most prominent being spring's:

https://github.com/spring-projects/spring-ai/tree/main/spring-ai-model/src/main/java/org/springframework/ai/tool/annotation

These annotations (and the one interface dependency) should be a part of the java mcp-sdk itself, rather than require spring dependencies (or other emerging implementations).

Context
b
It would be helpful to have Tool/ToolParam/ToolAnnotations/ToolResult annotations that are part of the java sdk, so that the MCP developer would not have to change annotations to use a different framework. Having Tool/ToolParam/ToolAnnotations/ToolResult annotations as part of the mcp itself rather than spring or any other specific framework would aid in that effort.

Inizia esaminando la directory delle annotazioni Spring AI collegata nell’issue e confrontando le annotazioni Tool, ToolParam, ToolAnnotations e ToolResult con l’attuale mcp-java-sdk. Il lavoro è completato quando l’SDK fornisce equivalenti indipendenti dal framework, così che gli sviluppatori MCP possano usare le stesse annotazioni senza Spring o un’altra dipendenza dall’implementazione.