Decide what to do when agent adds liquidity to a OUTCOME_TOKEN/sDAI pool

[gabrielfior]

Consider the scenario where the trader agent mints outcome tokens (depositing sDAI) and provides all its outcome tokens as liquidity to a pool.
After providing liquidity, it gets LP tokens back, which provide entitlement to a set of outcome tokens + sDAI.

The method seer.get_position should be expanded, so that it checks for this LP token balance as part of its logic.

This edge case does not initially affects the trader agents (which should just buy/sell tokens), but still deserves consideration.