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
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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.

Commencez par examiner le répertoire d’annotations Spring AI lié dans l’issue et comparer ses annotations Tool, ToolParam, ToolAnnotations et ToolResult avec le mcp-java-sdk actuel. Le travail est considéré comme terminé lorsque le SDK fournit des équivalents indépendants du framework, afin que les développeurs MCP puissent utiliser les mêmes annotations sans Spring ni autre dépendance d’implémentation.