Adapt Replicator agent for Safe usage

[gabrielfior]

Currently, the replicator agent (Terraform definition here) uses a private_key to execute transactions on-chain.
On #200 we added support for Safe, and the way to make an agent execute its transactions via its Safe is by adding the environment variable SAFE_ADDRESS to the runtime.
However, specifically in the replicator case, once we add the SAFE_ADDRESS, previous markets created by the replicator won't be accessed anymore, since creator will now be the safe_address instead of the public_key associated to the replicators private_key`. Hence there will be a transition period for the replicator agent.

We decided to split market creation from market solving - hence 2 steps:

1. Create a new replicator agent (without a SAFE_ADDRESS but with the same private_key from the current replicator) that simply checks for markets created by it and solves them (removes funding, closes them, etc) however DOES NOT replicate new markets. Call this REPLICATOR_AGENT_EOA

2. Refactor the replicator (with a SAFE_ADDRESS) so that the same logic is executed, but it uses the SAFE_ADDRESS as creator.
   In order to avoid re-replicating markets, it also checks if a market with that title already exists on Omen, and if so, does not create the market.
   Call this replicator REPLICATOR_AGENT_SAFE.