Phase 1 implementation for backup performance improvements

[sseago]

Describe the problem/challenge you have
This includes implementation of Phase 1, as described in #7474

ItemBlock model, ItemBlockAction plugin type, and backup logic refactoring to make use of these.

What is not included is the worker thread changes to allow processing of multiple items at the same time.

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[sseago]

This will be implemented in several PRs. Tentative PR plan:

1. ItemBlockAction (IBA) plugin type
2. Implement IBA plugins for internal velero plugins (pod/pvc/pv/etc)
3. ItemBlock model and backup workflow changes
4. Documentation for the feature under site/content/docs/main

[shubham-pampattiwar]

@sseago tentative plan makes sense.

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 14 days. If a Velero team member has requested log or more information, please provide the output of the shared commands.

[shubham-pampattiwar]

not stale

[blackpiglet]

unstale