Add google.WithUserAgent

[jonjohnsonjr]

To match remote.WithUserAgent

#830

[codecov-io]

Codecov Report

Merging #900 (2a08e08) into master (d1ffc8b) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #900      +/-   ##
==========================================
+ Coverage   72.53%   72.63%   +0.09%     
==========================================
  Files         108      108              
  Lines        4672     4677       +5     
==========================================
+ Hits         3389     3397       +8     
+ Misses        773      770       -3     
  Partials      510      510              

Impacted Files	Coverage Δ
pkg/v1/google/list.go	62.92% <100.00%> (+0.85%)	⬆️
pkg/v1/google/options.go	90.00% <100.00%> (+19.41%)	⬆️

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