APIv2: Add docker compatible volume endpoints

This change implements docker compatibile endpoint for interacting with
volumes. The code is mostly lifted from the `libpod` API handlers but
decodes and constructs data using types defined in the docker API
package.

Some notable support caveats with the current implementation:
  * we don't return the nullable `Status` or `UsageData` keys when
    returning volume information for inspect and create endpoints
  * we don't support filters when pruning
  * we return a fixed `0` for the `SpaceReclaimed` key when pruning
    since we have no insight into how much space was freed from runtime

Signed-off-by: Matt Brindley <58414429+maybe-sybr@users.noreply.github.com>

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