Split ContactsCollection

[chibenwa]

Why?

Because it does both indexing of the contact locally and forwards it to OpenPaaS

However with #1163 OpenPaaS is the source of truth and would anyway forward back collected contacts to James if any

CF

We thus do not want given that feature to index contacts locally.

(We do not want contact auto-collection to override openpaas Data)

How

Drop ContactsCollection

Use directly James' ContactExtractor for interop with OpenPaaS instread.

For standalone James write a IndexContact mailet indexing the contact locally.