Add retrieve_all_sbom_roots_by_name() func

[JimFuller-RedHat]

Add retrieve_all_sbom_roots_by_name function that searches for a component(s) by name in a specific sbom, then returns that components root component.

Can be used thusly:

        let roots = service
            .retrieve_all_sbom_roots_by_name(sbom_id, component_name, ())
            .await?;

Intended for use in #1014

Note - most of graph is based on string values ... this was an explicit design decision I do with graph stuff up front, its likely at some point I will revert these values back to some normal types at some point (ex. sbom_id would be stored in graph as a Uuid).