🎨 chore: add spotless format checker

[gangb-tech]

No description provided.

[codecov-commenter]

Codecov Report

Merging #35 (86711de) into main (bd1948e) will decrease coverage by 0.63%.
The diff coverage is 93.75%.

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@@             Coverage Diff              @@
##               main      #35      +/-   ##
============================================
- Coverage     75.67%   75.05%   -0.63%     
- Complexity      276      278       +2     
============================================
  Files            32       32              
  Lines           995      994       -1     
  Branches         69       70       +1     
============================================
- Hits            753      746       -7     
- Misses          199      204       +5     
- Partials         43       44       +1     

Impacted Files	Coverage Δ
.../java/com/featureprobe/sdk/server/AccessEvent.java	87.50% <ø> (-6.25%)	⬇️
.../java/com/featureprobe/sdk/server/CustomEvent.java	0.00% <ø> (ø)
...featureprobe/sdk/server/DefaultEventProcessor.java	69.69% <0.00%> (-1.30%)	⬇️
...probe/sdk/server/DefaultEventProcessorFactory.java	100.00% <ø> (ø)
.../com/featureprobe/sdk/server/EvaluationResult.java	72.72% <ø> (ø)
...c/main/java/com/featureprobe/sdk/server/Event.java	62.50% <ø> (-37.50%)	⬇️
...in/java/com/featureprobe/sdk/server/FPContext.java	67.39% <ø> (ø)
...ain/java/com/featureprobe/sdk/server/FPDetail.java	80.00% <ø> (ø)
...java/com/featureprobe/sdk/server/FeatureProbe.java	60.00% <0.00%> (-0.34%)	⬇️
.../com/featureprobe/sdk/server/FileSynchronizer.java	65.00% <ø> (ø)
... and 25 more