Rename crates turbopack-build -> turbopack-nodejs and turbopack-dev -> turbopack-browser (#7658)
### Description
Follow-up on the earlier change in the stack, this renames the packages
to better reflect what they hold.
We already have `turbopack-node` so `turbopack-nodejs` might have to be
merged with that crate, I can do that in a follow-up PR, this PR is only
renaming the crates.
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