No generated examples when using multi format schema object

[Gyllsdorff]

Description

https://www.asyncapi.com/docs/reference/specification/v3.0.0#messageObject

payload Multi Format Schema Object | Schema Object | Reference Object Definition of the message payload. If this is a Schema Object, then the schemaFormat will be assumed to be "application/vnd.aai.asyncapi+json;version=asyncapi" where the version is equal to the AsyncAPI Version String.

The AsyncAPI spec says we can provide the schemas in 3 ways:

1. A inline schema
2. A reference to a schema
3. A object with the keys schemaFormat and schema where schema will be either a inline schema or a reference to a schema

If you use option 3 then MessageHelpers.generateExample will call the sample generator with the {"schemaFormat": ..., "schema": ...} root object instead of the actual schema that is found under schema.schema. 😅

It is possible to work around this in some cases by providing the schema using option 1 or 2 if you only use a syntax that is compatible with application/vnd.aai.asyncapi+json but that don't support AVRO based schemas for example.

Fix: Check in https://github.com/asyncapi/asyncapi-react/blob/master/library/src/helpers/message.ts#L9 if the object matches the shape of a "multi format schema object" and call the ´schema.schema` in that case.

I can provide a PR if that fix is acceptable.

Expected result A basic example

Actual result A empty example

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[AceTheCreator]

Hey @Gyllsdorff, kindly go ahead and open a PR 👍🏾

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