safe-global / safe-client-gateway / 9060281009

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Filter out imitation transfers (#1524)

Adds `trusted` param-specific filtering of imitation transfers behind a feature flag. It removes outgoing, ERC-20 transfers that imitate the value and recipient in vanity of their neighbour.

It maps over the transaction history, keeping the transaction if the following conditions are met:

1. Was transaction executed by Safe?
2. Is there no previous transactions?
3. Is (previous transaction...
   - ..._not_ an ERC-20 transfer?
   - ...incoming?
   - ...of different value?
   - ...to same recipient?
   - ..._not_ an imitation address?

1989 of 2420 branches covered (82.19%)

Branch coverage included in aggregate %.

20 of 46 new or added lines in 3 files covered. (43.48%)

7010 of 7275 relevant lines covered (96.36%)

318.66 hits per line