[BUG] schemaValidation does not allow string examples for other schema types

[timonback]

Describe the bug.

The spectral rule schemaValidation currently enforces that all examples have the same type as the schema type. However, we believe that there are cases in AsyncAPI, where it is needed to accept string examples regardless of the schema type.

Expected behavior

No error/validation message when using string examples

Screenshots

N/A

How to Reproduce

1. Use the AsyncAPI document: Allow plain string in Message Example Object field payload for non-json payloads (like xml, yaml) spec#1038 (comment)
2. See the error: 66:11 error asyncapi-schema-examples "0" property type must be object components.schemas.io.github.springwolf.examples.kafka.dtos.XmlPayloadDto.examples[0]

🥦 Browser

None

👀 Have you checked for similar open issues?

• I checked and didn't find similar issue

🏢 Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

Are you willing to work on this issue ?

Yes I am willing to submit a PR!

Initial proposal, after issue is approved: https://github.com/asyncapi/parser-js/compare/master...timonback:parser-js:fix/GH-997?expand=1

[github-actions]

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[timonback]

Relates to stoplightio/spectral#2624 (Now I believe that async api studio uses parser-js only, not the spectral ruleset)
Relates to asyncapi/spec#1038 (embedding xml examples as strings in a (JSON) AsyncAPI document)

[github-actions]

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