feat: add share metrics

[derrandz]

Overview

This PR adds the following metrics to the share module:

• node_share_requests_count
• node_share_request_duration
• node_share_request_size
• node_share_eds_size

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords

[renaynay]

What's the update on this PR?

[ramin]

@renaynay i'll take this and get cleaned up and ready, unless you feel it should be abandoned?

[distractedm1nd]

Idk, I think this can be abandoned - we have custom metrics for the individual getters that are more useful, and I dont like the idea of adding yet another wrapping layer to getters.

A better approach would be adding individual metrics to ipld retrieval/IpldGetter, similar to ShrexGetter. We have metrics for the eds store so that's enough for StoreGetter. These implementations have their own interesting metrics and adding an abstraction layer that just counts up isnt very helpful.