Integrate FastMCP

This commit integrates FastMCP, a high-level MCP server implementation originally written by Jeremiah Lowin,
into the official MCP SDK. It also updates dependencies and adds new dev dependencies.
It moves the existing SDK into a .lowlevel .

src/mcp/server/fastmcp/__init__.py

@@ -0,0 +1,8 @@
+"""FastMCP - A more ergonomic interface for MCP servers."""
+
+from importlib.metadata import version
+from .server import FastMCP, Context
+from .utilities.types import Image
+
+__version__ = version("mcp")
+__all__ = ["FastMCP", "Context", "Image"]