Added openapi 3.1

[carloscbl]

Fixes #1396 .

connexion 3 was supposed to support openapi 3.1

Changes proposed in this pull request:

• This PR is incomplete, but it allows you to load an 3.1 openapi and the later you can use your custom validators.
• Without this changes you cannot even try to load openapi 3.1
• Maybe maintainers want to upgrade default validators from draf4 to at least draft 7 or latest or just leave as it is and you can just extend the validator
• Or make validators change if you are using openapi 3.1
• Also tests are missing for openapi 3.1

[sameerhussain]

Hi,
Woud you please provide any updates in this regards @carloscbl ?

If you need any help, I am ready to help here to add more code to get this merged.

[carloscbl]

Hi, Woud you please provide any updates in this regards @carloscbl ?

If you need any help, I am ready to help here to add more code to get this merged.

I have this working for some time in a custom version. I want to clarify:

This gives support to openapi 3.1 connexion works perfectly with it and validates the schema, requests and responses.

But is not a 100% openapi 3.1 validation some other parts of the code reference some kind of validation that is using older drafts.

On my day to day for our extensive uses cases we found no problems running it.

So imho is ready to merge.