Fix memory leaks and OOM issues in streaming processing

[hanahmily]

Fix the issue by implementing deduplication logic in priority queues
and improving sliding window memory management.

related to apache/skywalking#13501

• Update the CHANGES log.

[hanahmily]

@mrproliu, could you redeploy the BanyanDB with this change to verify if the OOM issue persists?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 74.41860% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.40%. Comparing base (a34e461) to head (f078433).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
banyand/measure/write_liaison.go	0.00%	6 Missing ⚠️
banyand/stream/write_liaison.go	0.00%	6 Missing ⚠️
pkg/flow/streaming/sliding_window.go	83.78%	3 Missing and 3 partials ⚠️
banyand/queue/pub/pub.go	57.14%	2 Missing and 1 partial ⚠️
pkg/flow/dedup_priority_queue.go	96.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #777       +/-   ##
===========================================
+ Coverage   38.17%   49.40%   +11.22%     
===========================================
  Files         300      304        +4     
  Lines       49741    49880      +139     
===========================================
+ Hits        18991    24643     +5652     
+ Misses      29319    23279     -6040     
- Partials     1431     1958      +527     

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