Provide a caching option for the @query decorator

[sorvell]

Description

Savvy users know that the @query decorator crawls the DOM on each access looking for a matching element. If these users are concerned about performance, they are inclined to access the property once and memoize it into another property. This kind of defeats the purpose of having the property in the first place.

However, sometimes it's important that the result of is dynamic. We can address both use cases by adding a caching option to the decorator, something like @query({cache: true}).

Acceptance criteria

Enhancement landed.