Move `pinning reupload` command to root level

[Cafe137]

The pinning reupload command takes a Swarm hash, and instructs the Bee node to fetch that data, stamp it with the same or a new postage batch, and reupload to the network.

This is useful when:

• The end user wants to re-stamp the data with a longer TTL postage batch
• When the postage batch has already expired, but the data is still retrievable from node caches
• When the file is erasure coded, and some chunks are missing ("repair")

So it doesn't make much sense to have this command hidden under the pinning group; it should be a top-level command instead.

Completion Criteria

• The command is available as swarm-cli reupload
• The reuploads also correctly get added to the upload history
• At least one integration test that runs the reupload command, and verifies that it has been added to the upload history with the new postage batch id