Add support for Swagger UI config param defaultModelExpandDepth

[pivaldi]

Describe the PR

Add support for the Swagger UI configutation parameter defaultModelExpandDepth See https://swagger.io/docs/open-source-tools/swagger-ui/usage/configuration/

Relation issue

None

Additional context

Support for the Swagger UI configutation parameter defaultModelsExpandDepth already exists but not for defaultModelExpandDepth (without s)

[Favoryoung]

This feature makes the documentation much more readable. Thank you.