Move Kafka-related functionality to stracer-kafka module [CE2] #282
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This is a back-port of #281
This PR moves all Kafka-related functionality into a separate stracer-kafka module. Since it's a breaking change (classes are removed from the main library and it's necessary to bring in a new one), the major version is bumped to 5.0.0.
Motivation: bringing stracer into the classpath automatically means bringing some version of skafka. Sometimes it's simply unnecessary (e.g. when data classes are received via HTTP), and sometimes it can be very inconvenient, e.g. when this library and some other pull different major versions of skafkainto the classpath, but ReportSpanRecord isn't used in the application, however, sbt screams about major version eviction.
Moreover, ReportSpanRecord is additional functionality, not directly related to the data classes that comprise the core of the library.