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/resources/__init__.py

@@ -0,0 +1,23 @@
+from .base import Resource
+from .types import (
+    TextResource,
+    BinaryResource,
+    FunctionResource,
+    FileResource,
+    HttpResource,
+    DirectoryResource,
+)
+from .templates import ResourceTemplate
+from .resource_manager import ResourceManager
+
+__all__ = [
+    "Resource",
+    "TextResource",
+    "BinaryResource",
+    "FunctionResource",
+    "FileResource",
+    "HttpResource",
+    "DirectoryResource",
+    "ResourceTemplate",
+    "ResourceManager",
+]