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.

Comienza revisando el directorio de anotaciones de Spring AI enlazado en el issue y comparando sus anotaciones Tool, ToolParam, ToolAnnotations y ToolResult con el mcp-java-sdk actual. Se considera completado cuando el SDK proporcione equivalentes independientes del framework, de modo que los desarrolladores de MCP puedan usar las mismas anotaciones sin Spring ni otra dependencia de implementación.