refactor(api): add Send + Sync trait when creating an instance #2569
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Description
I'm currently implementing wasmer inside Krustlet (krustlet/krustlet#677). Then I had to force the thread safety of trait object used to create a wasmer instance. I know it could be a breaking change and maybe I miss some backgrounds about this. So feel free to let me know what do you think and how we could have a better implementation if needed. I'm open to any suggestions.