Add Benchmark measurements to Codecs

[sappenin]

This project has some interesting Ed25519 benchmark test coverage that we should adapt in order to gauge the performance of our Codec libraries.

In addition, if we ever fix #164, we should run the benchmark against the new implementation and the existing implementation to validate the new code actually runs more efficiently.

See https://www.baeldung.com/java-microbenchmark-harness for a good tutorial on Benchmark.