add code generation phase to Compilation
add `output.iife` options to remove iife wrapper
add `experiments.outputModule` which enabled `output.module`
add `output.module` which sets defaults to `output.iife: false`, `output.libraryTarget: "module"`, `output.jsonpScriptType: "module"`, `terserOptions.module: true`
add `output.module` example
improve runtime requirements needed by ConcatenatedModule
add entry inlining, which inlines entry module code into runtime scope (only when safe)
make whole bundle strict when all modules are strict