extend fread yaml support for other types

[ben-schwen]

Closes #3999

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.01%. Comparing base (e26cf1b) to head (a1daab4).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
R/fread.R	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7899      +/-   ##
==========================================
- Coverage   99.02%   99.01%   -0.01%     
==========================================
  Files          88       88              
  Lines       17376    17377       +1     
==========================================
  Hits        17206    17206              
- Misses        170      171       +1     

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[github-actions]

No obvious timing issues in HEAD=fread_yaml

Generated via commit a1daab4

Download link for the artifact containing the test results: ↓ atime-results.zip

Task	Duration
R setup and installing dependencies	2 minutes and 20 seconds
Installing different package versions	37 seconds
Running and plotting the test cases	4 minutes and 44 seconds