Do not wrap a binary expression after an elvis operator

[paul-dingemans]

Description

Do not wrap a binary expression after an elvis operator in case the max line length is exceeded

Use sets internally in KtlintAssertThat rather than lists for storage and comparing of LintViolations. Like the KtlintRuleEngine duplicate violations are to be ignored.

Closes #2128

Checklist

Before submitting the PR, please check following (checks which are not relevant may be ignored):

• Commit message are well written. In addition to a short title, the commit message also explain why a change is made.
• At least one commit message contains a reference Closes #<xxx> or Fixes #<xxx> (replace<xxx> with issue number)
• Tests are added
• KtLint format has been applied on source code itself and violations are fixed
• CHANGELOG.md is updated
• PR description added

Documentation is updated. See difference between snapshot and release documentation

• Snapshot documentation in case documentation is to be released together with a code change
• Release documentation in case documentation is related to a released version of ktlint and has to be published as soon as the change is merged to master
• In case of adding a new rule, it needs to be added to experimental rules documentation