* replaces topics with seq of ContentFilters
* update topics to contentFilter
* updates the contentFilter structure
one content topic per content filter instead of a sequence of topics
* updates store json rpc api
* renames ContentFilter to HistoryContentFilter
* unit test for a query with several content filters
* makes shortcut for store api
* updates chat2
* clean up
* renames topic to contentTopic
* clarifies the use of content topic in store api
* clarifies the use of contentTopic in the init method of HistoryContentFilter
* Refactor: Move waku_store into its own folder
* Refactor: Move waku store types to new home (WIP)
* Refactor: Fix errors and recursive imports
* Fix rebase errors
* Refactor: More rebase import fixes