add IPFS integration

[Vectorrent]

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• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
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Implements the use_ipfs argument, as documented here.

IPFS nodes will not respond to ping in the way Hivemind expects, so we also set ensure_bootstrap_success to False, when IPFS is used. Nevertheless, HivemindStrategy will connect to peers successfully once training begins.

[codecov]

Codecov Report

Merging #34 (e6fa0b4) into main (2c83356) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

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[Vectorrent]

Closing this, because I couldn't add additional commits to it. That feature requires a branch in my remote repo - which I've created now, in #35 .