Add property .editorconfig property ktlint_enum_entry_name_casing

[paul-dingemans]

Description

This property allows enum entry names to be restricted to:

• upper_cases: an enum entry may only contain uppercases, and underscores, and digits, and dicritics on letters and strokes
• camel_cases: an enum entry may only contain CamelCase values, including digits, and dicritics on letters and strokes)
• upper_or_camel_case: allows both the upper_cases and camel_cases styles as defined in the Kotlin Coding Conventions

Closes #2835

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