[Fix #10689] Fix autocorrect for Layout/FirstHashElementIndentation and Layout/FirstArrayElementIndentation

[j-miyake]

Fixes #10689

This PR fixes the autocorrect for Layout/FirstHashElementIndentation and Layout/FirstArrayElementIndentation each combined with Layout/HashAlignment.

The new behavior indents the elements of a hash in a hash (or an array in a hash) based on the parent hash key when the parent hash is a method argument and has a following other sibling pair.

Example code to be corrected:

func x: {
  a: 1,
       b: 2
},
     y: { # following sibling pair in the parent hash
  c: 1,
       d: 2
}

func x: [
  :a,
       :b
],
     y: [ # following sibling pair in the parent hash
  :c,
       :d
]

In the original behavior, the code is corrected like

func x: {
  a: 1,
  b: 2
},
     y: { # following sibling pair of the parent hash
       c: 1,
       d: 2
     }

func x: [
  :a,
  :b
],
     y: [ # following sibling pair in the parent hash
       :c,
       :d
     ]

With this fix, the code is corrected like

func x: {
       a: 1,
       b: 2
     },
     y: { # following sibling pair in the parent hash
       c: 1,
       d: 2
     }

func x: [
       :a,
       :b
     ],
     y: [ # following sibling pair in the parent hash
       :c,
       :d
     ]

The autocorrect keeps the original behavior when the parent hash has no other following pairs. (I could change this so that the elements of the hash are always indented based on the parent hash key, but I kept the original behavior this time)

func x: {
  a: 1,
       b: 2
}

# corrected into
func x: {
  a: 1,
  b: 2
}

---

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• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
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[bbatsov]

The changes look good, but your branch has to be rebased on top of the current master branch due to merge conflicts.

[j-miyake]

I updated the PR. Thanks!