* migrates to hive.go database package

* review fixes

* alias types and vars from hive.go's db package

* Move database to tempdir to prevent sideeffects in tests

* fix import

Co-authored-by: Wolfgang Welz <welzwo@gmail.com>

Signed-off-by: Luca Moser <moser.luca@gmail.com>

* fix: use queue for neighbor connection

* refactor: do not request transactions via event

* fix: remove unused connection

* chore: fix linter warnings

* feat: improve gossip events and logs

* fix: log after connection is closed

- lru cache
- soldifier for tangle
- ...