Rename `baseExtremumBy` and `createExtremumBy` helpers.
Rename `baseExtremumBy` and `createExtremumBy` helpers.

r14r-work/fork_javascript_lodash,r14r/fork_javascript_lodash,r14r/fork_javascript_lodash,r14r/fork_javascript_lodash,r14r-work/fork_javascript_lodash,r14r-work/fork_javascript_lodash