refactor: Split TypeData nullability to new property. #249

Job	Run time
test-cli (ai21.yaml)	54s
test-cli (anthropic.yaml)	43s
test-cli (assemblyai.yaml)	58s
test-cli (cohere.yaml)	1m 14s
test-cli (huggingface.yaml)	55s
test-cli (ipinfo.yaml)	52s
test-cli (langsmith.yaml)	1m 43s
test-cli (leonardo.yaml)	54s
test-cli (mystic.yaml)	1m 4s
test-cli (ollama.yaml)	45s
test-cli (openai.yaml)	1m 22s
test-cli (petstore.yaml)	48s
test-cli (replicate.yaml)	51s
test-cli (special-cases.yaml)	53s
test-cli (together.yaml)	51s
test-cli (heygen.yaml)	52s
test-cli (instill.yaml)	1m 0s
Publish / Build, test and publish	2m 35s
Release	0s
	19m 14s

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