Remove redundant 'ToCharArray' call rule + fixer

[PendingChanges]

feat: add GC2333 — Remove redundant ToCharArray call

Summary

Adds a new analyzer and code fixer GC2333 that detects and removes redundant calls to string.ToCharArray() in foreach loops.

In C#, iterating over a string directly with foreach is equivalent to iterating over char[] returned by ToCharArray(). The extra call allocates an unnecessary array on the heap.

Rule

ID	GC2333
Category	Performance
Severity	Warning

Triggers on:

foreach (char c in s.ToCharArray())  // ⚠ GC2333
    Console.WriteLine(c);

Fixed to:

foreach (char c in s)
    Console.WriteLine(c);

Changes

• GC2333.RemoveRedundantToCharArrayCall.cs — analyzer: detects foreach expressions of the form <string>.ToCharArray() and verifies the method belongs to System.String via the semantic model
• GC2333.RemoveRedundantToCharArrayCall.Fixer.cs — code fixer: replaces the full invocation expression with the string instance
• Rule.cs — registers the new rule ID
• G2333.RemoveRedundantToCharArrayCall.Tests.cs — tests: empty-code no-op + fix scenario

Tests

All 240 tests pass.

[Copilot]

Pull request overview

Adds a new GC2333 analyzer + code fixer that flags foreach loops iterating over string.ToCharArray() and rewrites them to iterate the string directly, eliminating the redundant char[] allocation. The PR also incidentally removes the <RestoreSources> element from two .csproj files.

Changes:

• New RemoveRedundantToCharArrayCall analyzer (on ForEachStatement) and matching RemoveRedundantToCharArrayCallFixer.
• Registers the new rule id GC2333 in Rule.Ids and adds a small test class with an empty-code case and a single fix scenario.
• Drops <RestoreSources>https://api.nuget.org/v3/index.json</RestoreSources> from Creedengo.Tool.csproj and Creedengo.Package.csproj (not mentioned in the PR description).

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/Creedengo.Core/Analyzers/GC2333.RemoveRedundantToCharArrayCall.cs	New analyzer detecting foreach (… in <string>.ToCharArray()).
src/Creedengo.Core/Analyzers/GC2333.RemoveRedundantToCharArrayCall.Fixer.cs	New code fixer replacing the invocation with the string receiver.
src/Creedengo.Core/Models/Rule.cs	Registers the GC2333 rule id constant.
src/Creedengo.Tests/Tests/G2333.RemoveRedundantToCharArrayCall.Tests.cs	Adds happy-path + empty-code tests for the new rule.
src/Creedengo.Tool/Creedengo.Tool.csproj	Removes the <RestoreSources> line (unrelated to the rule).
src/Creedengo.Package/Creedengo.Package.csproj	Same <RestoreSources> removal as above.

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