add deterministic chunk ids and make it default
StatsTestCases no longer need to explicitly use natural ids as the defaults are deterministic now too
add concept of id name hints for chunks
add `idHint` option to splitChunks to provide a hint
deduplicated code from different id plugins to IdHelpers
improve behavior of named ids in case of conflicts
remove `name: true` and `automaticNamePrefix` from splitChunks it's not as good as expected
improve named chunk ids to show root modules
add optimization options
use development mode for watch/hot/config tests
use production mode for integration/stats tests
create output directory if not existing
move __esModule to runtime
fix dependency behavior for cases without usedExports