Drop support for Node < 16

[codenirvana]

• Dropped support for Node < v16
• Migrate to GitHub Actions

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (feature/v6@8994155). Click here to learn what that means.
The diff coverage is n/a.

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@@              Coverage Diff              @@
##             feature/v6    #3145   +/-   ##
=============================================
  Coverage              ?   89.92%           
=============================================
  Files                 ?       21           
  Lines                 ?     1151           
  Branches              ?      349           
=============================================
  Hits                  ?     1035           
  Misses                ?      116           
  Partials              ?        0           

Flag	Coverage Δ
cli	82.18% <0.00%> (?)
integration	41.00% <0.00%> (?)
library	58.55% <0.00%> (?)
unit	74.10% <0.00%> (?)

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