Add spring-pulsar to assessment project

[onobc]

Let's add spring-pulsar to Spring IO assessment tool once we move out of experimental project repo.

[onobc]

• make sure our labels are inline w/ the labels they use

Use https://dorukdestan.com/github-label-manager/dorukdestan.com to copy labels from https://github.com/spring-projects/spring-boot/labels

[onobc]

• add our project in the tool and fill out some meta info about us and the repo I believe.