Validate trailing comma in multi-line function declaration

Problem/Motivation

There is a coding standard now to require trailing commas on multi-line function declarations in #3295249: Allow multi-line function declarations.

Steps to reproduce

This should throw an error on PHP higher than 8.0 because comma missing

/**
 * Last parameter should have a trailing comma.
 */
function test29(
  int $a,
  string $b
) {
  echo "Hello";
}

Proposed resolution

Check if we can find any existing sniff upstream and use that. Otherwise contribute improvement or write sniff in Coder.

Remaining tasks