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This makes it easier to tell where module boundaries are.

And expose a separate function for _just_ getting want-blocks. When the user
runs `ipfs bitswap wantlist`, they expect to see everything the node is
currently looking for.
Co-Authored-By: dirkmc <dirkmdev@gmail.com>

This makes reading the docs much easier as it's clear what's "private" and
what's not.

fixes #238