Add rule blank-line-between-when-conditions

[paul-dingemans]

Description

Add rule blank-line-between-when-conditions.

Depending on .editorconfig property ij_kotlin_line_break_after_multiline_when_entry blank lines are added between all when-entries in a when-statement if the statement contains at least one multiline when-entry.

Simple when-statements (e.g. all when-entries are single line) then blank lines between the when-entries are removed (regardless of ij_kotlin_line_break_after_multiline_when_entry)

Closes #2533

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
• PR title is short and clear (it is used as description in the release changelog)
• PR description added (background information)

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