Ability to provide a custom service name for spans

[worldtiki]

Issue described here: #865

[codecov]

Codecov Report

Merging #866 into master will decrease coverage by 0.01%.
The diff coverage is 80%.

@@             Coverage Diff              @@
##             master     #866      +/-   ##
============================================
- Coverage     81.14%   81.13%   -0.02%     
+ Complexity     5691     5688       -3     
============================================
  Files           409      409              
  Lines         18328    18342      +14     
  Branches       2126     2126              
============================================
+ Hits          14873    14882       +9     
- Misses         2438     2443       +5     
  Partials       1017     1017

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/lettuce/core/tracing/Tracing.java	57.14% <0%> (-22.86%)	4 <0> (ø)
...ain/java/io/lettuce/core/tracing/BraveTracing.java	80.76% <88.88%> (+0.46%)	8 <3> (+1)	⬆️
...uce/core/masterslave/SentinelTopologyProvider.java	80.55% <0%> (-2.78%)	9% <0%> (-1%)
...a/io/lettuce/core/protocol/ConnectionWatchdog.java	79.72% <0%> (-2.1%)	38% <0%> (-1%)
.../io/lettuce/core/protocol/CommandExpiryWriter.java	73.07% <0%> (-1.93%)	15% <0%> (-1%)
.../io/lettuce/core/dynamic/ReactiveTypeAdapters.java	85.13% <0%> (ø)	1% <0%> (ø)	⬇️
src/main/java/io/lettuce/core/RedisPublisher.java	80.66% <0%> (+0.37%)	5% <0%> (ø)	⬇️
.../java/io/lettuce/core/protocol/CommandHandler.java	76.9% <0%> (+0.81%)	102% <0%> (+1%)	⬆️

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[worldtiki]

I noticed the travis tests are a bit flaky. Rerunning will cause different tests to fail (unrelated to these changes).

[worldtiki]

I noticed there was some duplication of ways to instantiate some objects.
For example the ClientResources.create / ClientResources.builder and DefaultClientResources.create / DefaultClientResources.builder.

Not sure if this is by design so I did the same and added static methods for both a default create and a builder in both the interface (Tracing) and implementation (BraveTracing).

[mp911de]

Thanks a lot. That's merged and polished now.

[worldtiki]

Awesome. Thanks :)