Update unavailable_function rule to also detect preconditionFailure() and abort()

[quinntaylor]

New Issue Checklist

• Updated SwiftLint to the latest version
• I searched for existing GitHub issues

Describe the bug

The unavailable_function rule warns when a function contains fatalError() with no other return branches, but does not detect preconditionFailure() or abort() calls, which also terminate execution.

Although Xcode fix-its often suggest fatalError(), some developers find it preferable to use preconditionFailure() instead.

https://lapcatsoftware.com/articles/fatalError.html

Environment

• SwiftLint version: 0.38.2
• Installation method used: macOS installer package
• Paste your configuration file:

opt_in_rules:
    - unavailable_function

• Are you using nested configurations? No
• Which Xcode version are you using? 12.0
• Do you have a sample that shows the issue? Yes

// This does NOT trigger a violation, but should:
class ViewController: UIViewController {
    public required init?(coder aDecoder: NSCoder) {
        preconditionFailure("init(coder:) has not been implemented")
    }
}

[quinntaylor]

PR: #3375

[quinntaylor]

@jpsim / @marcelofabri, is it possible to get some eyes on this issue and PR? Thanks!