feat: add publish-subscribe design pattern (#2898) (#3223)

* feat: add publisher-subscriber design pattern (#2898)

* fix: check styles on publisher-subscriber design pattern (#2898)

* fix: check styles on publisher-subscriber design pattern (#2898)

* fix: check styles on publisher-subscriber design pattern (#2898)

* fix: improve coverage on publisher-subscriber design pattern (#2898)

* fix: fix dependancy on publisher-subscriber design pattern (#2898)

* fix: fix documentation on publisher-subscriber design pattern (#2898)

* fix: apply spotless on publisher-subscriber design pattern (#2898)

* fix: changes after review on publisher-subscriber design pattern (#2898)

* fix: changes after review on publisher-subscriber design pattern (#2898)

* fix: fix sonar on publisher-subscriber design pattern (#2898)

* fix: fix sonar on publisher-subscriber design pattern (#2898)

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Co-authored-by: Sanura Hettiarachchi <sanura.hettiarachchi@tipico.com>