feat: add mcp_resource_trigger

[hallvictoria]

Added new decorators for mcp_resource_trigger

Examples:

@app.mcp_resource_trigger(
        arg_name="context",
        uri="file://readme.md",
        resource_name="myresource"
)
def mcp_resource_trigger(context) -> None:
    """A generic MCP tool trigger for the hello_mcp tool."""
    pass

@app.mcp_resource_trigger(
        arg_name="context",
        uri="file://readme.md",
        resource_name="myresource",
        title="",
        description="",
        mime_type="",
        size=1024,
        metadata=""
)
def mcp_resource_trigger(context) -> None:
    """A generic MCP tool trigger for the hello_mcp tool."""
    pass