fix(otel-node): Move @opentelemetry/api to prod dependencies

[jomi-se]

Fix for #846

I dunno if you guys have some other stuff to add to this

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[david-luna]

Hi @jomi-se

thanks for your contribution to fix the issue :)

if you sing the CLA I would be able to run the CI and merge the fix for the next release.

Cheers

[trentm]

FYI: I have some questions on how to repro the issue on #846

[trentm]

Do you possibly have this pnpm setting set to false? https://pnpm.io/settings#peer-dependency-settings
What version of pnpm are you using?

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Whatever the answer, I think I agree that @opentelemetry/api should be in "dependencies" rather than just in "peerDependencies". I wonder how this has no bitten the many @opentelemetry/* packages that do this.