[EPIC] Activity Simplification (Backend)

[dlipicar]

Problem

The whole activity flow is a monster, we cannot ensure its stability and it consumes a lot of RPC calls. We need to simplify it.

Proposal

https://www.notion.so/Activity-Proposals-for-2-31-4ceaea4116714d0080f3aede6b819084

Steps

• Mark old API as deprecated

Fetching

• Add DB tables to store raw blockchain data separately from "interpreted" blockchain data and account information
• Simplify fetching to include detect only recent activity (keep the minimum necessary to trigger balance refreshes)

Storage

• Add DB tables to store full required information when sending a transaction (bundle + single tx data)
• Migrate entries from the old multi_transactions and transfers tables to the new ones.
• Remove old DB tables

Filtering

• Disable complex filter

[friofry]

Added subtask #5825 for the storage part