Problem: eventsourcing is the whole organization

[yrashk]

And we're using the same name for es4j for naming maven artifacts and package names, which might make it more difficult to assign proper naming to other solutions.

Proposed solution 1: rename com.eventsourcing:eventsourcing-X maven artifacts to com.eventsourcing:es4j-X and packages com.eventsourcing.* to com.eventsourcing.es4j.*

Proposed solution 2: rename com.eventsourcing:eventsourcing-X maven artifacts to org.es4j:es4j-X and packages com.eventsourcing.* to org.es4j.*

Proposed solution 3: rename com.eventsourcing:eventsourcing-X maven artifacts to com.eventsourcing:es4j-X and packages com.eventsourcing.* to org.es4j.*

Proposed solution 4: find a completely different name for es4j