feat: add timeline writer

[everpcpc]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 12.09964% with 247 lines in your changes missing coverage. Please review.

Project coverage is 75.93%. Comparing base (66d69c7) to head (b3be8c8).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/timeline/writer.ts	10.40%	241 Missing ⚠️
lib/types/fetcher.ts	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1010      +/-   ##
==========================================
- Coverage   76.97%   75.93%   -1.05%     
==========================================
  Files         141      142       +1     
  Lines       17262    17521     +259     
  Branches      975      975              
==========================================
+ Hits        13288    13305      +17     
- Misses       3963     4205     +242     
  Partials       11       11              

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