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fix Search/GetValue to be Kad compliant. Default quorum is now 0 which means do not abort the query early

* feat: Expose the ProviderManager through the IpfsDht struct
* feat: expose providers prefix so that we do not have to hard code it in other places
Co-authored-by: Aarsh Shah <aarshkshah1992@gmail.com>

fixes #274

When the routing table is empty, `Run` would fail but _not_ close the
process (leaking some query goroutines). This patch fixes this in multiple
places by:

1. Not starting queries with no peers.
2. Failing queries with no peers earlier.

This reverts commit 7e68ac3c.

Also, de-duplicate some logic.

fixes #177

fixes #172

err is nil in this case