Add AllowComments option to Style/RedundantInitialize

[koic]

Follow up #10524 (comment).

This PR add AllowComments option to Style/RedundantInitialize is true by default.

# AllowComments: true (default)

# good
def initialize
  # Overriding to negate superclass `initialize` method.
end

# AllowComments: false

# bad
def initialize
  # Overriding to negate superclass `initialize` method.
end

This cop has been reported as false positive and has already been marked as unsafe. In addition, cases such as the follow up address have been reported. This PR allows intentional overrides with explicit comments to be allowed by default.

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Before submitting the PR make sure the following are checked:

• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Ran bundle exec rake default. It executes all tests and runs RuboCop on its own code.
• Added an entry (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.

[bbatsov]

Thanks!