[Sim] Transform lake data into prediction signals for trader

[KatunaNorbert]

Target

Create prediction signal that is suitable to be used for the trader step

Parent epic: #1257 Integrate subgraph prediction into sim trading

TODO

• [x] Transform the lake data into prediction signals Read data from pdr_payouts table, filter payouts by slot and calculate the prediction from roundSumStakes and roundSumStakesUp Final data should be stored slot - prediction pairs list
• [x] Use prediction signal inside trader sim
• [x] Test and Verify