Support comments when removing spaces between chained functions

[mannylopez]

Updating the blankLinesBetweenChainedFunctions rule to take comments into account when removing blank lines between chained functions.

So this:

[0, 1, 2]
    .map { $0 * 2 }

    // Multiplies by 3
    .map { $0 * 3 }

Will turn into:

[0, 1, 2]
    .map { $0 * 2 }
    // Multiplies by 3
    .map { $0 * 3 }

cc @calda

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.23%. Comparing base (b0d492f) to head (e8d8656).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1723 +/- ## =========================================== + Coverage 95.19% 95.23% +0.03% =========================================== Files 20 20 Lines 23248 23250 +2 =========================================== + Hits 22131 22141 +10 + Misses 1117 1109 -8 ```

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[nicklockwood]

This looks good, thanks! I'm wondering if this should be put behind some sort of option though, in case there are scenarios where a developer deliberately wanted to leave a blank line above commented methods in the chain but remove them otherwise?