Allow overriding the primitive type of fields

[snowzach]

Allows you to specify a custom type in case you've altered the default json handling behavior.

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[snowzach]

Do I need to generate everything with bazel to make this pass CI?

[johanbrandhorst]

Do I need to generate everything with bazel to make this pass CI?

Yes, but there's a handy oneliner in CONTRIBUTING.md

[googlebot]

CLAs look good, thanks!

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[codecov-io]

Codecov Report

Merging #1003 into master will decrease coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1003      +/-   ##
==========================================
- Coverage   53.45%   53.42%   -0.03%     
==========================================
  Files          40       40              
  Lines        4028     4030       +2     
==========================================
  Hits         2153     2153              
- Misses       1676     1677       +1     
- Partials      199      200       +1

Impacted Files	Coverage Δ
protoc-gen-swagger/genswagger/template.go	54.17% <0%> (-0.11%)	⬇️

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[johanbrandhorst]

Thanks so much for your contribution and careful and attentive replies to my questions, great work!