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.

Start by reviewing the Spring AI annotation directory linked in the issue and comparing its Tool, ToolParam, ToolAnnotations, and ToolResult annotations with the current mcp-java-sdk. Done means the SDK provides framework-independent equivalents so MCP developers can use the same annotations without Spring or another implementation dependency.