[Enhancement] eliminate type assertions in the switch case.[cloudevents.go]

[Alonexc]

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Enhancement Request

This issue is a subproject issue of eventmesh. the subproject address is: https://github.com/apache/eventmesh-go located at: eventmesh-go/plugin/protocol/cloudevents/cloudevents.go analysis and expalanation: assigning the result of this type assertion to a variable (switch msg := msg.(type)) could eliminate type assertions in switch cases

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Are you willing to submit PR?

• [ ] Yes I am willing to submit a PR!

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