Consistently use Dataclasses in Python SDK (#216) #457

Job	Run time
.NET SDK Tests (macos-latest)	1m 39s
Go SDK Tests (ubuntu-latest)	1m 15s
Python SDK Tests (windows-latest)	2m 24s
Python SDK Tests (macos-latest)	1m 2s
Node.js SDK Tests (windows-latest)	1m 39s
Python SDK Tests (ubuntu-latest)	1m 3s
Node.js SDK Tests (ubuntu-latest)	40s
Go SDK Tests (windows-latest)	2m 17s
Go SDK Tests (macos-latest)	1m 7s
.NET SDK Tests (windows-latest)	3m 30s
Node.js SDK Tests (macos-latest)	44s
.NET SDK Tests (ubuntu-latest)	1m 20s
	18m 40s

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