feat: added a particle callback function that will be executed when the particle is removed

[wonderfulLand]

I think this function is still necessary.

[AlmasB]

Hi, thanks for this. Please can you provide a use case example.

[wonderfulLand]

Hi, thanks for this. Please can you provide a use case example.

https://www.bilibili.com/video/BV1iz4y1s7WW/?spm_id_from=333.337.search-card.all.click&vd_source=33227c9937f8f5c6629d4a8cb0e5be97
The URL above is a small demo. The raindrops in the video are simulated using a particle system. When raindrops fall onto the surface of the lake, they can cause ripples.

[DeathPhoenix22]

Hi,
I was thinking of doing this! If it gets in the Engine, thanks for it :)

[AlmasB]

@wonderfulLand Thanks for clarifying. I've just made a few editorial changes to maintain consistency. It's all merged now.

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (cb70500) 59.52% compared to head (e151899) 59.73%.
Report is 32 commits behind head on dev.

Files	Patch %	Lines
...java/com/almasb/fxgl/particle/ParticleEmitter.java	40.00%	3 Missing ⚠️
...tlin/com/almasb/fxgl/particle/ParticleComponent.kt	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #1286      +/-   ##
============================================
+ Coverage     59.52%   59.73%   +0.20%     
- Complexity     2953     2961       +8     
============================================
  Files           308      308              
  Lines         15197    15256      +59     
  Branches       1558     1556       -2     
============================================
+ Hits           9046     9113      +67     
+ Misses         5628     5622       -6     
+ Partials        523      521       -2     

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