Add additional PeerDAS metrics (#6018)

[KatyaRyazantseva]

Issue Addressed

This PR addresses issue #6018, the list of the additional PeerDAS metrics.

Proposed Changes

Added the following metrics:

Custody:

• Total count of columns in custody (counter)

Gossipsub:

• Number of bytes received from each topic (deduplicated) (counter)

Libp2p:

• Number of requests received (counter)
• Number of responses received (counter)

[CLAassistant]

All committers have signed the CLA.

[KatyaRyazantseva]

Renamed topic_msg_recv_bytes metric to topic_msg_recv_bytes_unfiltered. It's kind of a breaking change but I guess metrics names should be put in order or we will have _unfiltered/_filtered mess. It's up to you, please share your feedback

[KatyaRyazantseva]

@jxs could you please review the libp2p metrics we've discussed?

[KatyaRyazantseva]

Added Req/Resp metrics:

• Number of requests sent (counter)
• Number of requests bytes sent (counter)
• Number of responses sent (counter)
• Number of responses bytes sent (counter)
• Number of requests bytes received (counter)
• Number of responses bytes received (counter)

[michaelsproul]

Please update to point at unstable by either:

1. Rebasing on unstable (if your branch has a small number of commits that are easy to tease out), or
2. Merging origin/das into this PR: git fetch origin; git merge origin/das. This will result in the smallest number of conflict resolutions and is better for branches that already contain merge commits or have extensive history.