Move biolink, caching to utils

[rjawesome]

biothings/biothings_explorer#825

[codecov]

Codecov Report

Attention: Patch coverage is 46.96970% with 35 lines in your changes missing coverage. Please review.

Project coverage is 51.30%. Comparing base (0e577b6) to head (c91100b).

Files with missing lines	Patch %	Lines
src/misc.ts	22.22%	14 Missing ⚠️
src/biolink.ts	63.88%	13 Missing ⚠️
src/log_entry.ts	33.33%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #5      +/-   ##
==========================================
+ Coverage   49.51%   51.30%   +1.78%     
==========================================
  Files           4        5       +1     
  Lines         206      269      +63     
  Branches       31       39       +8     
==========================================
+ Hits          102      138      +36     
- Misses         99      128      +29     
+ Partials        5        3       -2     

Flag	Coverage Δ
	51.30% <46.96%> (?)

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