* extract common part
* make process/exporter generic
* update dependencies
* update all the tests and docs
* clean up
* changelog
* update readme
* prevent LogRecord to be inherited
* simplify example
* simplify the code
* revert accidental change
* consolidate log and trace processor
* avoid OpenTelemetry.Common namespace
* add benchmarks
* skip test for netcoreapp2.1
* restrict log benchmark to netcoreapp3.1 for now