[SQL Lab] Async query results serialization with MessagePack and PyArrow (#8069)

* Add support for msgpack results_backend serialization

* Serialize DataFrame with PyArrow rather than JSON

* Adjust dependencies, de-lint

* Add tests for (de)serialization methods

* Add MessagePack config info to Installation docs

* Enable msgpack/arrow serialization by default

* [Fix] Prevent msgpack serialization on synchronous queries

* Add type annotations

setup.py

@@ -84,6 +84,7 @@ setup(
         "humanize",
         "isodate",
         "markdown>=3.0",
+        "msgpack>=0.6.1, <0.7.0",
         "pandas>=0.24.2, <0.25.0",
         "parsedatetime",
         "pathlib2",
@@ -91,6 +92,7 @@ setup(
         "python-dateutil",
         "python-dotenv",
         "python-geohash",
+        "pyarrow>=0.14.1, <0.15.0",
         "pyyaml>=5.1",
         "retry>=0.9.2",
         "selenium>=3.141.0",