Add benchmarks for client.AddTemplate

[willbeason]

Add benchmarks for client.AddTemplate for a simple ConstraintTemplate and a complex one. The complex ConstraintTemplate is a copy of UniqueIngressHost. It's okay if this falls out of sync with the ConstraintTemplate it's based on - what matters is having a complex CT, not that it exactly matches one.

constraint$ go test ./pkg/client --bench=. --benchmem
goos: linux
goarch: amd64
pkg: github.com/open-policy-agent/frameworks/constraint/pkg/client
cpu: Intel(R) Xeon(R) W-2135 CPU @ 3.70GHz
BenchmarkClient_AddTemplate/Simple/1_Templates-12         	     129	   9058282 ns/op	 1200880 B/op	   23595 allocs/op
BenchmarkClient_AddTemplate/Simple/2_Templates-12         	      61	  17941913 ns/op	 2379309 B/op	   47185 allocs/op
BenchmarkClient_AddTemplate/Simple/5_Templates-12         	      25	  46099557 ns/op	 5940319 B/op	  117951 allocs/op
BenchmarkClient_AddTemplate/Simple/10_Templates-12        	      12	  90045892 ns/op	11881112 B/op	  235928 allocs/op
BenchmarkClient_AddTemplate/Simple/20_Templates-12        	       6	 182456681 ns/op	23753468 B/op	  471812 allocs/op
BenchmarkClient_AddTemplate/Simple/50_Templates-12        	       3	 457135641 ns/op	59113586 B/op	 1179453 allocs/op
BenchmarkClient_AddTemplate/Simple/100_Templates-12       	       2	 915068659 ns/op	118516644 B/op	 2359408 allocs/op
BenchmarkClient_AddTemplate/Simple/200_Templates-12       	       1	1703187888 ns/op	236725560 B/op	 4719088 allocs/op
BenchmarkClient_AddTemplate/Complex/1_Templates-12        	      97	  10802338 ns/op	 1390259 B/op	   28547 allocs/op
BenchmarkClient_AddTemplate/Complex/2_Templates-12        	      46	  22915279 ns/op	 2877124 B/op	   60237 allocs/op
BenchmarkClient_AddTemplate/Complex/5_Templates-12        	      16	  63753467 ns/op	 8055650 B/op	  174220 allocs/op
BenchmarkClient_AddTemplate/Complex/10_Templates-12       	       8	 149904414 ns/op	18973611 B/op	  427264 allocs/op
BenchmarkClient_AddTemplate/Complex/20_Templates-12       	       3	 385724089 ns/op	49822754 B/op	 1170057 allocs/op
BenchmarkClient_AddTemplate/Complex/50_Templates-12       	       1	1471954431 ns/op	211890088 B/op	 5291328 allocs/op
BenchmarkClient_AddTemplate/Complex/100_Templates-12      	       1	4261518166 ns/op	715699320 B/op	18469732 allocs/op
BenchmarkClient_AddTemplate/Complex/200_Templates-12      	       1	13000580510 ns/op	2596388776 B/op	68489749 allocs/op

Fixes #151

Signed-off-by: Will Beason willbeason@google.com

[codecov-commenter]

Codecov Report

Merging #159 (596bf83) into master (8b4a99a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #159   +/-   ##
=======================================
  Coverage   43.97%   43.97%           
=======================================
  Files          56       56           
  Lines        3131     3131           
=======================================
  Hits         1377     1377           
  Misses       1379     1379           
  Partials      375      375           

Flag	Coverage Δ
unittests	43.97% <ø> (ø)

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[maxsmythe]

LGTM

[sozercan]

LGTM