Switch to go modules

[johanbrandhorst]

Fixes #755

@achew22 Do I need to do anything more WRT bazel here? I've just removed WORKSPACE since I assume it's superfluous with the module definitions.

[johanbrandhorst]

Obviously still WIP, but I wanted to get the ball rolling on this

[achew22]

I think reverting the delete of the WORKSPACE is all you should need to do to get it working in Bazel. Once you merge this I'll do a follow up to upgrade to the latest rules_go which has proper support for go modules and clean it up in there a bit.

[johanbrandhorst]

I think this should be ready for a review @achew22.

The node tests are still using a vendor folder instead of a GOPATH but that's okay I think.

The generate test now includes running go mod tidy afterwards because otherwise it seems to make the resty dependency indirect. I don't understand how that all interacts.

[codecov-io]

Codecov Report

Merging #870 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #870   +/-   ##
=======================================
  Coverage   52.99%   52.99%           
=======================================
  Files          39       39           
  Lines        3910     3910           
=======================================
  Hits         2072     2072           
  Misses       1642     1642           
  Partials      196      196

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[johanbrandhorst]

🎉