feat(devtools-api): add no-op stub under node export condition

[danielroe]

noticed in nuxt that vue-router (which imports and calls setupDevToolsPlugin under a condition) was pulling in the entire devtools stack on the server, including devframe, etc.

one solution is simply to provide a node stub.

Note

I'm opening this PR as draft in order to test it out and see if this works to solve the tracing of all of these extra dependencies.

update testing on nuxt, this PR saved us ~213K on a production build e🤯

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