Summary

CodeSplitting reuses some calculate result from previous build.

The new code splitting steps are as following:

1. Analyze blocks to find all chunk entry
2. Find chunk modules in parallel
3. Find chunk's parents and children based on incoming blocks and outgoing blocks
4. Remove modules in chunk which are already present in the parent chunks
5. Create chunk and chunk group, connect chunk and module

We can cache results from step 1, step 2 and reuse some chunk in step 5, so next stages in seal can get information about which chunk has changed

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).