Added rate limit sampler via a property

[marcingrzejszczak]

fixes gh-1162

[marcingrzejszczak]

@shakuzen @adriancole

[codecov-io]

Codecov Report

Merging #1175 into master will decrease coverage by 0.21%.
The diff coverage is 68.75%.

@@             Coverage Diff             @@
##             master   #1175      +/-   ##
===========================================
- Coverage     69.91%   69.7%   -0.22%     
- Complexity      757     764       +7     
===========================================
  Files           138     140       +2     
  Lines          3444    3456      +12     
  Branches        373     373              
===========================================
+ Hits           2408    2409       +1     
- Misses          822     833      +11     
  Partials        214     214

Impacted Files	Coverage Δ	Complexity Δ
.../cloud/sleuth/zipkin2/ZipkinAutoConfiguration.java	100% <ø> (ø)	5 <0> (ø)	⬇️
...mework/cloud/sleuth/sampler/SamplerProperties.java	100% <100%> (ø)	5 <2> (+2)	⬆️
...work/cloud/sleuth/sampler/RateLimitingSampler.java	60% <60%> (ø)	2 <2> (?)
...cloud/sleuth/sampler/SamplerAutoConfiguration.java	62.5% <62.5%> (ø)	3 <3> (?)
...ing/TracingConnectionFactoryBeanPostProcessor.java	67.85% <0%> (-5.36%)	6% <0%> (ø)

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[codefromthecrypt]

cc also @devinsba @anuraaga

[marcingrzejszczak]

fixed via 2579e78