Pipe events

[jwoertink]

Purpose

This is an extension required for the upcoming Breeze updates.

Description

Similar to what we've added in Avram, this adds in a new PulsarEvent that publishes each time a pipe runs. When a pipe is executed, we publish if the pipe was continued or halted for both before and after pipes.

Right now, there's nothing subscribing to these events, so when they publish, nothing actually happens. In the future, Breeze will subscribe to these to track the pipes.

Checklist

• - An issue already exists detailing the issue/or feature request that this PR fixes
• - All specs are formatted with crystal tool format spec src
• - Inline documentation has been added and/or updated
• - Lucky builds on docker with ./script/setup
• - All builds and specs pass on docker with ./script/test

[jwoertink]

@paulcsmith if you get a free min, would love to get your thoughts on this. No rush since I'll probably just update breeze and wait for the next Lucky release to add this stuff in

[paulcsmith]

I think a position with one event class makes sense 👍

[paulcsmith]

Looks good 👍

[jwoertink]

Awesome! Thanks for the review!