Add Activity Logs parenting system

[T-Dnzt]

Some of the activity logs don't have much meaning on their own. It'd be nice to have parents/main activity logs with children like:

• User insert token <- no parent, top log -> 1
• Mint gets inserted <- parent 1
• transaction gets inserted <- parent 1
• transaction gets updated by local ledger <- parent 1

We could therefore only show the top logs in the admin panel and allow the retrieval of its children when a user wants more details.