TypeBodyLengthRule should not count conditional directives

[Sega-Zero]

New Issue Checklist

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

Describe the bug

type_body_length rule counts lines with conditional directives as lines of code, which is not correct. Example:

class Test {
  func foo() {
    #if DEBUG
    print("test")
    #endif 
  }
}

How many lines are in foo function? swiftlint thinks there are 5 lines, but there's 3 lines of code.
This rule ignores comments and whitespaces already since they are not an actual lines of code (#369). So, why a conditional directives does count?
I believe it's an incorrect rule behaviour.

Environment

• SwiftLint version (run swiftlint version to be sure)?
  0.39.1
• Installation method used (Homebrew, CocoaPods, building from source, etc)?
  CocoaPods

swiftlint ouptut for sample above:

$ pbpaste | swiftlint lint --no-cache --use-stdin --enable-all-rules
Loading configuration from '.swiftlint.yml'
<nopath>:1:1: warning: Type Body Length Violation: Type body should span 3 lines or less excluding comments and whitespace: currently spans 4 lines (type_body_length)

using sample yml:

type_body_length: 3

[stale]

This issue has been automatically marked as stale because it has not had any recent activity. Please comment to prevent this issue from being closed. Thank you for your contributions!

[Sega-Zero]

commenting. still reproducing this

[stale]

This issue has been automatically marked as stale because it has not had any recent activity. Please comment to prevent this issue from being closed. Thank you for your contributions!