feat: add CloudEvents Message Traits as a component

[Lazzaretti]

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title: "add CloudEvents Message Traits as a component"

• Add a CloudEvents Message Traits as a new official component that can be referred to as discussed in Proposal to add official CloudEvents Traits to the AsyncAPI ownership spec-json-schemas#623
• This PR should come together with a PR in the docs repo feat: using CloudEvents with AsyncAPI website#4819
  to describe the component and how to use it, suggested URL: https://www.asyncapi.com/docs/reference/message-formats/cloudevents.

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Related issue(s):

• Problem and discussion: Proposal to add official CloudEvents Traits to the AsyncAPI ownership spec-json-schemas#623
• [FEATURE REQUEST] Natively support envelopes, e.g., CloudEvents #432 describes an alternative approach, with native support for envelopes
• Intermediate solution in the CloudEvents repo was discussed in AsyncAPI v3 Trait for CloudEvents cloudevents/spec#1276 and merged into the cloudevents repo: https://github.com/cloudevents/spec/blob/main/cloudevents/working-drafts/asyncapi.md
• Documentation: feat: using CloudEvents with AsyncAPI website#4819

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[derberg]

@Lazzaretti I'm closing this one, more details on reasoning in the linked issue