New Issue: [Library Stabilization] Capitalization of Round enum constants in BigInteger module

17723, "lydia-duncan", "[Library Stabilization] Capitalization of Round enum constants in BigInteger module", "2021-05-13T16:37:20Z"

The Round enum uses all caps for the constants. Our standard module best practices guide says "Enum type names should be camelCase. The enum values should also be camelCase." This enum should be updated to follow that guideline