[draft] implement multi chapter generation of novels

[femto]

Features it's a draft of implement multi chapter generation of novels.

[codecov-commenter]

Codecov Report

Attention: 30 lines in your changes are missing coverage. Please review.

Comparison is base (23c2762) 83.31% compared to head (bbbafdf) 82.42%. Report is 24 commits behind head on dev.

Files	Patch %	Lines
metagpt/actions/define.py	76.37%	30 Missing :warning:

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #866      +/-   ##
==========================================
- Coverage   83.31%   82.42%   -0.90%     
==========================================
  Files         225      226       +1     
  Lines       12456    12583     +127     
==========================================
- Hits        10378    10371       -7     
- Misses       2078     2212     +134     

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