bidder script v0.5.0

[Evan-Kim2028]

Experience - The bidder script is prematurely exiting without closing down the bidder node. This requires ps aux | grep mev-commit -> kill to be used to end the bidder node manually. This seems to be triggered when the auto bidder window function fails at the beginning of the script (e.g. insufficient funds).

Expectations - not having to manually kill the bidder node when this happens