wrap ProviderQueryManager as a composable router and re-integrate in Bitswap

[petar]

Step 1 of https://github.com/ipfs/go-libipfs/issues/85.

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[Jorropo]

This repository has been moved to https://github.com/ipfs/go-libipfs. There is not an easy way to transfer PRs, so if you would like to continue with this PR then please re-open it in the new repository and link to this PR.