Add MessagePack serialization as a top level dependency, closes #771

setup.py

@@ -6,7 +6,7 @@
     DESCRIPTION = "".join([line for line in f if "gh-dark-mode-only" not in line])
 
 # Required dependencies
-install = ["faiss-cpu>=1.7.1.post2", "torch>=1.12.1", "transformers>=4.28.0"]
+install = ["faiss-cpu>=1.7.1.post2", "msgpack>=1.0.7", "torch>=1.12.1", "transformers>=4.28.0"]
 
 # Required dependencies that are also transformers dependencies
 install += ["huggingface-hub>=0.19.0", "numpy>=1.18.4", "pyyaml>=5.3", "regex>=2022.8.17"]
@@ -37,7 +37,6 @@
 extras["api"] = [
     "aiohttp>=3.8.1",
     "fastapi>=0.94.0",
-    "msgpack>=1.0.7",
     "pillow>=7.1.2",
     "python-multipart>=0.0.7",
     "uvicorn>=0.12.1",
@@ -91,6 +90,7 @@
     "pymagnitude-lite>=0.1.43",
     "scikit-learn>=0.23.1",
     "sentence-transformers>=2.2.0",
+    "skops>=0.9.0",
 ]
 
 extras["workflow"] = [