Expose more board filters

[mglaman]

We can expose some of the issue query options as filters. For example, any of the tags used to filter a list

[mglaman]

The main use case presented at DrupalCon was this:

• Convert the parent issue field value to a multiple field value
• Allow exposing that as a dropdown

There are some problems. The naming of it. Do we just show the Node ID? Do we show the remote title?

[chicagomom]

Another helpful exposed filter would be component. We are re-doing the Getting Involved Guide, which is a component of the Community section. We'd like to be able to either filter the existing drupal_org_community kanban by component, or create a board just for the issues surrounding the Getting Involved Guide component.

[hansfn]

Related issue: #79