Add .editorconfig property ij_kotlin_indent_before_arrow_on_new_line

[paul-dingemans]

Description

Add .editorconfig property ij_kotlin_indent_before_arrow_on_new_line

When ij_kotlin_indent_before_arrow_on_new_line is enabled, the arrow in a when-entry should be indented when it starts on a new line.

• For intellij_idea and android_studio keep formatting same as the ugly but default IDEA formatting. Note that the closing curly brace is de-indented compared to arrow. For those code styles this property needs to be set to true to keep formatting compatible with default IDEA Formatting when using IDEA version 2024.2 or above.
• For ktlint_official code style apply a more consistent formatting by indenting the entire block body (including closing curly brace) relative to the indented arrow.

Closes #2808

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