Add ToDictionary extensions on IDictionary

[Copilot]

Ports ToDictionary extensions from CliFx, enabling typed conversion of a non-generic IDictionary to Dictionary<TKey, TValue>.

Changes

• DictionaryExtensions.cs: New file with an extension(IDictionary) block containing two overloads:
  • ToDictionary<TKey, TValue>(IEqualityComparer<TKey> comparer) — casts each DictionaryEntry to the typed key/value pair and delegates to Enumerable.ToDictionary with the given comparer.
  • ToDictionary<TKey, TValue>() — uses EqualityComparer<TKey>.Default as the comparer.
• DictionaryExtensionsTests.cs: Covers result type, comparer identity, and key/value contents for both overloads.

Usage

IDictionary raw = new Hashtable { ["one"] = 1, ["two"] = 2 };

// With explicit comparer
Dictionary<string, int> typed = raw.ToDictionary<string, int>(StringComparer.OrdinalIgnoreCase);

// With default comparer
Dictionary<string, int> typed = raw.ToDictionary<string, int>();

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.61%. Comparing base (667c235) to head (bfd71bf).
⚠️ Report is 5 commits behind head on prime.

Additional details and impacted files

@@            Coverage Diff             @@
##            prime      #41      +/-   ##
==========================================
+ Coverage   94.47%   94.61%   +0.14%     
==========================================
  Files          76       80       +4     
  Lines        1574     1615      +41     
  Branches      131      134       +3     
==========================================
+ Hits         1487     1528      +41     
  Misses         65       65              
  Partials       22       22              

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[Copilot]

Pull request overview

Adds a new ToDictionary<TKey, TValue>(IEqualityComparer<TKey>) extension for non-generic IDictionary, enabling conversion into a typed Dictionary<TKey, TValue> while allowing the caller to control key comparison semantics.

Changes:

• Added an extension(IDictionary) block with ToDictionary<TKey, TValue>(IEqualityComparer<TKey>) in CollectionExtensions.
• Added a new xUnit test covering IDictionary → Dictionary<TKey, TValue> conversion behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
PowerKit/Extensions/CollectionExtensions.cs	Introduces IDictionary.ToDictionary<TKey, TValue>(comparer) conversion implemented via DictionaryEntry + LINQ ToDictionary.
PowerKit.Tests/CollectionExtensionsTests.cs	Adds test coverage for the new ToDictionary extension.

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