Repeated Construction of ObjectMapper hurting performance

[jonnekaunisto]

I have an application that is publishing a lot of metrics.

Through profiling I was able to see that around 3% of CPU usage was going into repeatedly constructing ObjectMapper in the EMF library.

I narrowed it down to this constructor:

aws-embedded-metrics-java/src/main/java/software/amazon/cloudwatchlogs/emf/model/RootNode.java

Line 49 in 4ccacf6

objectMapper = new ObjectMapper();

Is it possible to make the ObjectMapper static?

[jaredcnance]

Closed by #67