feat!: add 3.0.0 validation support

[jonaslagoni]

When this is merged, from version 6 and onwards, all pre-release spec versions will be released as a regular feature request, before the spec itself is released.

The pre-release version will be released as if it was not a pre-release, for example for AsyncAPI 3.0, it will be released as normal:

module.exports = {
    'schemas': {
        ...
        '3.0.0': require('./schemas/3.0.0.json'),
    },
    'schemasWithoutId': {
        ...
        '3.0.0': require('./schemas/3.0.0-without-$id.json'),
    }
};

However, while the it's still a pre-release, the underlying schemas CAN contain breaking changes from version to version, up until the spec is released. This means that one AsyncAPI document using v3 in the pre-release stage might be valid in 6.0.0, but invalid in the 6.1.0. This ONLY applies to pre-release schemas, and NOT regular ones that is set in stone.

If you want to make sure you don't use a schema not released yet, you have to whitelist which versions you allow in your tool.

This PR is created upfront to reflect on a daily basis what things are included in the release.

Also, the reason to create this PR a long time before the release is to enable automation (bot keeps upstream branches always up to date with master, see this action) that we have in place to regularly update the release branch with whatever is changed in the master branch. So nobody has to do it manually.

[jonaslagoni]

This PR is a duplicate of #208 as it was incorrectly merged.

[sonarqubecloud]

SonarCloud Quality Gate failed.   

4 Bugs
0 Vulnerabilities
0 Security Hotspots
6 Code Smells

No Coverage information
0.0% Duplication

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[derberg]

/rtm

[asyncapi-bot]

🎉 This PR is included in version 6.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[asyncapi-bot]

🎉 This PR is included in version 6.0.0-next-major-spec.17 🎉

The release is available on:

• npm package (@next-major-spec dist-tag)
• GitHub release

Your semantic-release bot 📦🚀