[Feature request] expose the batch information

[ddelpiano]

Right now @stappan is using the tag system to mark the list of KS prior export, which is an information that we already have through the batch table.

My proposal is to:

• exposes the batches in the composer UI, so a user can see to which batch(es) a KS belongs to.
• augment the filter to filter by batches.

[stappan]

I still think that we would need to enable the KS itself to have an annotation about which export it was a part of.

[ddelpiano]

@stappan should this annotation be in the tags or a dedicated property? I would go for the latter, otherwise the tag will become a black hole of information used for anything.