feat: nullable in OAS 3.0 is equivalent to union with null type in 3.1#42

b41ex merged 12 commits intodevelopNetcracker/qubership-apihub-api-diff:developfrom

feature/oas-30-to-31-comparisonNetcracker/qubership-apihub-api-diff:feature/oas-30-to-31-comparisonCopy head branch name to clipboard