Add option to output only the last mint when running `fresh dump output.csv`

[Conor Odell]

See title.

Currently Freshmint-CLI will dump all NFTs minted into output.csv, but for additional editions that are minted, the output doesn't need every single NFT ever minted in the output csv.

[Peter Siemens]

For now, we solved this by adding a --tail option to the fresh dump command.

This will dump the last 10 minted NFTs.

fresh dump --tail 10 minted.csv

I am going to put more thought into how to track and save separate mint sessions.

[Peter Siemens]

Closing this since the latest version of Freshmint removes the fresh dump command and instead prints mint results as part of the fresh mint command.