Promote experimental rules

[paul-dingemans]

Description

Promote rules below to non-experimental rules:

• blank-line-before-declaration
• context-receiver-wrapping
• discouraged-comment-location
• enum-wrapping
• function-naming
• function-signature
• if-else-bracing
• multiline-expression-wrapping
• if-else-wrapping
• no-blank-line-in-list
• no-consecutive-comments
• no-empty-file
• no-empty-first-line-in-class-body
• no-single-line-block-comment
• parameter-list-spacing
• property-naming
• statement-wrapping
• string-template-indent
• try-catch-finally-spacing
• type-argument-list-spacing
• type-parameter-list-spacing
• unnecessary-parentheses-before-trailing-lambda

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