Add ability to disable certain instrumentations

[felixbarny]

closes #87

[codecov-io]

Codecov Report

Merging #95 into master will increase coverage by 0.04%.
The diff coverage is 90%.

@@             Coverage Diff              @@
##             master      #95      +/-   ##
============================================
+ Coverage      75.9%   75.94%   +0.04%     
- Complexity      842      856      +14     
============================================
  Files            92       92              
  Lines          3025     3043      +18     
  Branches        263      264       +1     
============================================
+ Hits           2296     2311      +15     
- Misses          591      593       +2     
- Partials        138      139       +1

Impacted Files	Coverage Δ	Complexity Δ
.../co/elastic/apm/bci/ElasticApmInstrumentation.java	100% <ø> (ø)	4 <0> (ø)	⬇️
...tic/apm/jdbc/PreparedStatementInstrumentation.java	83.33% <100%> (+0.98%)	7 <1> (+1)	⬆️
.../co/elastic/apm/jdbc/StatementInstrumentation.java	88.23% <100%> (+0.73%)	8 <1> (+1)	⬆️
...g/webmvc/SpringTransactionNameInstrumentation.java	59.37% <100%> (+1.31%)	6 <1> (+1)	⬆️
...co/elastic/apm/plugin/api/SpanInstrumentation.java	68.42% <100%> (+1.75%)	5 <1> (+1)	⬆️
...tic/apm/plugin/api/TransactionInstrumentation.java	62.96% <100%> (+1.42%)	5 <1> (+1)	⬆️
...lastic/apm/servlet/FilterChainInstrumentation.java	28.26% <100%> (+1.59%)	6 <1> (+1)	⬆️
...co/elastic/apm/jdbc/ConnectionInstrumentation.java	94.11% <100%> (+0.36%)	7 <1> (+1)	⬆️
...c/apm/plugin/api/ElasticApmApiInstrumentation.java	53.12% <100%> (+1.51%)	5 <1> (+1)	⬆️
...co/elastic/apm/servlet/ServletInstrumentation.java	33.33% <100%> (+1.75%)	6 <1> (+1)	⬆️
... and 3 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 53611b3...04e07f7. Read the comment docs.