Phased out of the removal of `version`.
Do not read it anymore.
`version` is used for encryption purposes, it is not a routing concern and hence should not be set on the Waku Message (which itself is a routing artefact)
* store connect evt: use enum instead of free strings for Waku event types
* store connect evt: more accurate enum name
* store connect evt: add store connect event on peer manager
* store connect evt: simplify logic statements
* store connect evt: test store connect
* store connect evt: export event types
* test: use enum
* Shorter name for waku events
