safe-global / safe-client-gateway / 9060281009 / 2

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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?

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