Add tests

python/ql/test/library-tests/frameworks/fastapi/middleware.py

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+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+app = FastAPI()
+
+origins = [
+    "*"
+]
+
+app.add_middleware(CORSMiddleware, allow_origins=origins, allow_credentials=True, allow_methods=["*"], allow_headers=["*"]) # $ CorsMiddleware=CORSMiddleware               

python/ql/test/library-tests/frameworks/starlette/Middleware.py

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+from starlette.applications import Starlette
+from starlette.middleware import Middleware
+from starlette.middleware.cors import CORSMiddleware
+
+routes = ...
+
+middleware = [
+    Middleware(CORSMiddleware, allow_origins=['*'], allow_credentials=True)  # $ CorsMiddleware=CORSMiddleware
+]
+
+app = Starlette(routes=routes, middleware=middleware)