Fix common typos in comments, method names, and variable names

[Akanksha-kedia]

Description

Fixed 4 common typos found throughout the codebase:

1. serialzied → serialized (comment)
2. deserialzeFrom → deserializeFrom (method name)
3. seperator → separator (variable name)
4. occured → occurred (comment)

[Akanksha-kedia]

@xiangfu0 please help to review

[codecov-commenter]

Codecov Report

❌ Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.27%. Comparing base (549a47c) to head (1a697bb).
⚠️ Report is 20 commits behind head on master.

Files with missing lines	Patch %	Lines
...ata/manager/realtime/RealtimeTableDataManager.java	0.00%	2 Missing ⚠️
...ealtime/writer/StatelessRealtimeSegmentWriter.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #17094      +/-   ##
============================================
- Coverage     63.47%   63.27%   -0.20%     
- Complexity     1424     1428       +4     
============================================
  Files          3086     3104      +18     
  Lines        182340   183349    +1009     
  Branches      27979    28096     +117     
============================================
+ Hits         115746   116022     +276     
- Misses        57662    58347     +685     
- Partials       8932     8980      +48     

Flag	Coverage Δ
custom-integration1	100.00% <ø> (ø)
integration	100.00% <ø> (ø)
integration1	100.00% <ø> (ø)
integration2	0.00% <ø> (ø)
java-11	63.21% <40.00%> (-0.21%)	⬇️
java-21	63.22% <40.00%> (-0.23%)	⬇️
temurin	63.27% <40.00%> (-0.20%)	⬇️
unittests	63.27% <40.00%> (-0.20%)	⬇️
unittests1	56.25% <0.00%> (-0.07%)	⬇️
unittests2	33.63% <40.00%> (-0.01%)	⬇️

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[xiangfu0]

Thanks for fixing this.