Add ability to center Awesomebar.Suggestion title text

[sblatz]

In Fenix, we would like to add suggestions that do not utilize the description portion of an Awesomebar.Suggestion. When we do this, the titles do not get vertically centered as they still leave room for a description to be set (see below). We can fix this by either:

1. Creating an Awesomebar.SimpleSuggestion that does not have a description field
2. Modifying Awesomebar.Suggestion so that if it does not have a description, it automatically centers the title accordingly.

Official mock ups for the feature we're using this on

Example

┆Issue is synchronized with this Jira Task

[sblatz]

This may not be necessary: see further discussion with Sebastian here.