cleanup: remove deprecated types

[ghosind]

For #5

[Copilot]

Pull Request Overview

Cleanup PR to remove deprecated collection types and their associated tests, including legacy Go 1.23 variants.

• Deleted the ConcurrentHashSet implementation and tests
• Deleted the HashDictionary and ConcurrentHashDictionary implementations and tests
• Removed Go 1.23-specific iterator variants for all deprecated types

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
set/concurrent_hashset_test.go	Removed tests for deprecated ConcurrentHashSet
set/concurrent_hashset_pre_go123.go	Removed pre-Go1.23 iterator implementation for ConcurrentHashSet
set/concurrent_hashset_go123.go	Removed Go1.23 iterator implementation for ConcurrentHashSet
set/concurrent_hashset.go	Removed deprecated ConcurrentHashSet implementation
dict/hashdict_test.go	Removed tests for deprecated HashDictionary
dict/hashdict_go123.go	Removed Go1.23 iterator implementation for HashDictionary
dict/hashdict.go	Removed deprecated HashDictionary implementation
dict/concurrent_hashdict_test.go	Removed tests for deprecated ConcurrentHashDictionary
dict/concurrent_hashdict_go123.go	Removed Go1.23 iterator implementation for ConcurrentHashDictionary
dict/concurrent_hashdict.go	Removed deprecated ConcurrentHashDictionary implementation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.31%. Comparing base (5f0fa65) to head (8d71bd8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #12      +/-   ##
==========================================
- Coverage   85.47%   81.31%   -4.17%     
==========================================
  Files          15        9       -6     
  Lines        1150      808     -342     
==========================================
- Hits          983      657     -326     
+ Misses        130      119      -11     
+ Partials       37       32       -5     

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