[improvement] Configurable Fee Parameters (Reduce AVAX Rounding)

Functional changes:

1. Reduce AVAX fee rounding to 50 navax
2. Remove 1 block scanner lag from Ethereum since this was initially to avoid re-org impact on fees and solvency which should no longer occur

Non-functional changes:

1. Some cleanup to move a few consts to the config package so we can tune them without releasing
2. Remove dead code for V1 Ethereum fee calculation which is no longer used