Microsoft.OpenApi v2 lacks support for `const` keyword in `OpenApiSchema`

[captainsafia]

The new updates to OpenApiSchema in v2 don't provide a way for modeling the const keyword from JSON schema in the document.

Perhaps we should provide an optional const property on the OpenApiSchema type?

[MaggieKimani1]

You're right, thank you for pointing this out. Working on adding support for this asap