Move biolink methods into utils

[tokebe]

Part of reverse-metaEdge injection support for biothings/biothings_explorer#861

[codecov]

Codecov Report

Attention: Patch coverage is 63.88889% with 13 lines in your changes missing coverage. Please review.

Project coverage is 51.65%. Comparing base (0e577b6) to head (ccdedeb).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/biolink.ts	63.88%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
+ Coverage   49.51%   51.65%   +2.13%     
==========================================
  Files           4        5       +1     
  Lines         206      242      +36     
  Branches       31       38       +7     
==========================================
+ Hits          102      125      +23     
- Misses         99      112      +13     
  Partials        5        5              

Flag	Coverage Δ
	51.65% <63.88%> (?)

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