Select optimization "winner" metric - highest reimbursement vs highest coverage, most schools

[nikolajbaer]

Different districts have different goals, so we ideally want the different strategies to pick the winner based upon different metrics.

This is somewhat available in the strategies base classes right now, but needs to be surfaced to the server.py / lambda API level so we can pass in our desired "best strategy" condition as part of the submission, and have that identify the winner.

[nikolajbaer]

this is now implemented, but next step is to add multi-objective optimization