Add a fallback method

[PhilipAxelrod]

No description provided.

[shadaj]

As soon as this method returns, these variables are no longer needed and may be cleaned up. You should probably create a new class for a fallback stream that stores these listeners.

This is super janky, but will be fixed with the new stream tracking mechanism, which I hope to PRify this week.

[PhilipAxelrod]

Wait, but they are needed though. It's to make sure that the foreach stuff is never cancelled

[shadaj]

I mean from the JVM perspective, those variables are not depended on by anyone and so would be cleaned out.

[PhilipAxelrod]

Would that mean that this line in the code for creating events

potassium/core/shared/src/main/scala/com/lynbrookrobotics/potassium/streams/Stream.scala

Line 510 in 198a1f4

val cancelFunction = this.foreach(v => updateEvent.apply(condition(v)))

will break?

[codecov]

Codecov Report

Merging #136 into master will decrease coverage by 0.48%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #136      +/-   ##
==========================================
- Coverage   64.92%   64.44%   -0.49%     
==========================================
  Files          68       68              
  Lines        1340     1350      +10     
  Branches      131      129       -2     
==========================================
  Hits          870      870              
- Misses        470      480      +10

Impacted Files	Coverage Δ
...om/lynbrookrobotics/potassium/streams/Stream.scala	86.44% <0%> (-5.18%)	⬇️

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[shadaj]

@paxelord do we want to move forward with this PR or just drop and replace with the simpler approach we discussed?