Add root property jsonSchemaDialect

[Maggie Kimani (MaggieKimani1)]

This PR:

• Adds a root property jsonSchemaDialect field and logic to serialize and deserialize
• Updates the SerializeAsV3() method by adding an optional OpenApiSpecVersion parameter in order to write out version-specific properties
• Adds a test for validation and refactors/cleans up existing tests

[Vincent Biret (baywet)]

Thanks for making these updates. The only remaining thing is this comment I had left earlier.
#1138 (comment)

Also, I'm not asking you to change that, but you could have simply passed callback instead of (w, o) => callback(w, o) in a lot of places. Saying that for future references for you :)

[Maggie Kimani (MaggieKimani1)]

Thanks for making these updates. The only remaining thing is this comment I had left earlier. #1138 (comment)

Also, I'm not asking you to change that, but you could have simply passed callback instead of (w, o) => callback(w, o) in a lot of places. Saying that for future references for you :)

Yes, I'm working on that too. I have tests failing locally due to writer scope issues when writing start and end objects with all the serialization refactoring I've implemented. I want to fix these as well and the PR will be good to go.
Also, thanks for the pointer above.