Update ArrayExtensions.swift

[fallwd]

For creating a dictionary.Dictionary(uniqueKeysWithValues:) is more efficient than reduce(into:) to. i used time profile and found a significant improvement.

Checklist

• [ x] I checked the Contributing Guidelines before creating this request.
• [ x] New extensions are written in Swift 5.6.
• [ x] New extensions support iOS 12.0+ / tvOS 12.0+ / macOS 10.13+ / watchOS 4.0+, or use @available if not.
• I have added tests for new extensions, and they passed.
• All extensions have a clear comments explaining their functionality, all parameters and return type in English.
• All extensions are declared as public.
• I have added a changelog entry describing my changes.

[fallwd]

let items = (1...1000000).map { String($0) }

func createDictUsingUniqueKeysWithValues() {
_ = Dictionary(uniqueKeysWithValues: items.enumerated().map { ($1, $0) })
}

func createDictUsingReduce() {
_ = items.enumerated().reduce(into: [:]) { $0[$1.element] = $1.offset }
}

time profile result:
items = (1...1000000).map { String($0) }
createDictUsingReduce() 125ms
createDictUsingUniqueKeysWithValues() 63ms

items = (1...100000000).map { String($0) }
createDictUsingReduce() 20.26s
createDictUsingUniqueKeysWithValues() 12.58s

[fallwd]

Darwin error:
/Users/runner/work/SwifterSwift/SwifterSwift/Sources/SwifterSwift/Foundation/NSAttributedStringExtensions.swift:112:63: error: cannot find 'pattern' in scope
guard let pattern = try? NSRegularExpression(pattern: pattern, options: options) else { return self }

[SwifterSwiftBot]

	2 Warnings
⚠️	Consider adding tests for new extensions or updating existing tests for a modified SwifterSwift extension
⚠️	The source files have been modified. Please consider adding a CHANGELOG entry if necessary.

	1 Message
📖	Thank you for submitting a pull request to SwifterSwift. The team will review your submission as soon as possible.

Generated by 🚫 Danger

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.22%. Comparing base (c4571a9) to head (3120295).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1226   +/-   ##
=======================================
  Coverage   68.22%   68.22%           
=======================================
  Files          98       98           
  Lines        3647     3647           
=======================================
  Hits         2488     2488           
  Misses       1159     1159           

Flag	Coverage Δ
macos	97.07% <100.00%> (ø)
tvos	59.04% <100.00%> (ø)

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