@flatjs/evolve

We should not create folder name like webpack in src/webpack;

1. while we use import { moduleX } from webpack; it will resolve moduleX from src/webpack instead import from node_modules
2. while use vitest it may broken cause of wrong webpack imported.
3. change src/webpack to src/create-webpack is ok.

Notes: cause of esm

1. import { webpack } from 'webpack' should be change to import webpack from 'webpack'
2. import { merge } from 'lodash' should be change to import _ from 'lodash'