Spring instrumentation

[felixbarny]

Adds an advice which automatically sets the transaction name according
to the handler

[codecov-io]

Codecov Report

Merging #82 into master will decrease coverage by 0.63%.
The diff coverage is 41.37%.

@@             Coverage Diff              @@
##             master      #82      +/-   ##
============================================
- Coverage     75.46%   74.82%   -0.64%     
  Complexity      778      778              
============================================
  Files            86       87       +1     
  Lines          2869     2900      +31     
  Branches        270      275       +5     
============================================
+ Hits           2165     2170       +5     
- Misses          567      595      +28     
+ Partials        137      135       -2

Impacted Files	Coverage Δ	Complexity Δ
.../co/elastic/apm/bci/ElasticApmInstrumentation.java	100% <ø> (ø)	3 <0> (ø)	⬇️
...astic/apm/spring/webmvc/ApmHandlerInterceptor.java	0% <0%> (-72.23%)	0 <0> (-5)
...g/webmvc/SpringTransactionNameInstrumentation.java	58.06% <57.14%> (ø)	5 <5> (?)

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