Add Endpoint benchmarks

[vkostyukov]

Put a very initial version of endpoint benchamakrs as well as went ahead and picked some low-hanging fruits in terms of reducing allocations (using something called TooFastString):

For matcher:

Before:

[info] MatcherBenchmark.stringSome                      avgt   20    34.758 ±   6.150   ns/op
[info] MatcherBenchmark.stringSome:·gc.alloc.rate.norm  avgt   20   120.000 ±   0.001    B/op

After:

[info] MatcherBenchmark.stringSome                      avgt   20    29.877 ±   2.720   ns/op
[info] MatcherBenchmark.stringSome:·gc.alloc.rate.norm  avgt   20   112.000 ±   7.127    B/op

For extractors

Before:

[info] Benchmark                                           Mode  Cnt     Score     Error   Units
[info] ExtractorBenchmark.booleanNone                      avgt   20  1601.956 ±  86.425   ns/op
[info] ExtractorBenchmark.booleanNone:·gc.alloc.rate.norm  avgt   20   592.001 ±   0.002    B/op
[info] ExtractorBenchmark.booleanSome                      avgt   20    70.483 ±   2.892   ns/op
[info] ExtractorBenchmark.booleanSome:·gc.alloc.rate.norm  avgt   20   240.000 ±   0.001    B/op
[info] ExtractorBenchmark.intNone                          avgt   20  1978.250 ± 239.277   ns/op
[info] ExtractorBenchmark.intNone:·gc.alloc.rate.norm      avgt   20   472.001 ±   0.002    B/op
[info] ExtractorBenchmark.intSome                          avgt   20    93.216 ±   3.607   ns/op
[info] ExtractorBenchmark.intSome:·gc.alloc.rate.norm      avgt   20   240.000 ±   0.001    B/op
[info] ExtractorBenchmark.stringSome                       avgt   20    52.364 ±   3.661   ns/op
[info] ExtractorBenchmark.stringSome:·gc.alloc.rate.norm   avgt   20   224.000 ±   0.001    B/op


After:

After:
[info] Benchmark                                           Mode  Cnt     Score     Error   Units
[info] ExtractorBenchmark.booleanNone                      avgt   20    14.859 ±   3.604   ns/op
[info] ExtractorBenchmark.booleanNone:·gc.alloc.rate.norm  avgt   20    24.000 ±   0.001    B/op
[info] ExtractorBenchmark.booleanSome                      avgt   20    69.588 ±  13.004   ns/op
[info] ExtractorBenchmark.booleanSome:·gc.alloc.rate.norm  avgt   20   224.000 ±   0.001    B/op
[info] ExtractorBenchmark.intNone                          avgt   20    57.572 ±   9.569   ns/op
[info] ExtractorBenchmark.intNone:·gc.alloc.rate.norm      avgt   20   120.000 ±   0.001    B/op
[info] ExtractorBenchmark.intSome                          avgt   20    70.062 ±   3.525   ns/op
[info] ExtractorBenchmark.intSome:·gc.alloc.rate.norm      avgt   20   256.000 ±   0.001    B/op
[info] ExtractorBenchmark.stringSome                       avgt   20    71.432 ±   6.939   ns/op
[info] ExtractorBenchmark.stringSome:·gc.alloc.rate.norm   avgt   20   200.000 ±   0.001    B/op

Note extra 16 bytes per intSome: the cost of a closure (option mapping) in .map(_.toInt).

[codecov-io]

Current coverage is 78.12%

Merging #465 into master will decrease coverage by -15.94% as of b17a3bd

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