refactor(model): register recommenders

[zhangzhenghao]

Summary

• add registries for collaborative filtering and click-through-rate models
• route model creation, model search, and model serialization/deserialization through registries
• preserve existing model type/name/header compatibility for BPR, ALS, and FM/AFM

Tests

• /usr/local/go/bin/go test ./model/cf ./model/ctr ./master ./worker

[codecov]

Codecov Report

❌ Patch coverage is 68.80734% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.48%. Comparing base (96527b3) to head (f201048).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
master/tasks.go	0.00%	16 Missing ⚠️
model/cf/model.go	82.50%	4 Missing and 3 partials ⚠️
model/ctr/model.go	81.08%	3 Missing and 4 partials ⚠️
model/ctr/fm.go	75.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1310      +/-   ##
==========================================
+ Coverage   73.27%   73.48%   +0.21%     
==========================================
  Files          93       93              
  Lines       17969    18046      +77     
==========================================
+ Hits        13166    13261      +95     
+ Misses       3391     3378      -13     
+ Partials     1412     1407       -5     

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