Describe the problem/challenge you have

Today there is no easy method of telling the resources inside backup, it is stored in a tarball in object store.
Operator may need to find the backups associate with the resources he/she interested.

Describe the solution you'd like

Add a SearchRequest API to address the needs, the backups needs to be indexed in a database to support the query efficiently.
The search query should support query by

• name, exact or glob pattern
• kind, by kind name
• namespace
• labels
• a combination of above four terms
• limits to the query results, too many results is not really useful, it needs to be parsed by human, and
  only a subset of backups is really needed, user can refine the search terms to identify the backups he/she interested.

Anything else you would like to add:

Environment:

• Velero version (use velero version):
• Kubernetes version (use kubectl version):
• Kubernetes installer & version:
• Cloud provider or hardware configuration:
• OS (e.g. from /etc/os-release):

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