@aliases endpoint should allow to filter by how an alias has been added (automatically, manually)

[tisto]

PR for adding aliases: #1398

The @Aliases endpoint allows to filter by path:

http://localhost:8080/Plone/++api++/@aliases&q=/de/ft/my-path

However, there is no way to filter by how an alias has been added, e.g.:

http://localhost:8080/Plone/++api++/@aliases&q=/de/ft/my-path&manual=true

I'd suggest adding a new parameter "manual" to the GET endpoint so that we can filter by "manual=true" or "manual=false"