Handle Gitlab closing comma separated actions

Parser configuration

const issueParser = require('issue-parser');
const parse = issueParser('gitlab');

Text to parse

From: Managing Issues > Default closing pattern

Awesome commit message

Fix #20, Fixes #21 and Closes group/otherproject#22.
This commit is also related to #17 and fixes #18, #19
and https://gitlab.com/group/otherproject/issues/23.

Current Behavior

{
  "actions": {
    "close": [
      {
        "raw": "Fix #20",
        "action": "Fix",
        "prefix": "#",
        "issue": "20"
      },
      {
        "raw": "Fixes #21",
        "action": "Fixes",
        "prefix": "#",
        "issue": "21"
      },
      {
        "raw": "Closes group/otherproject#22",
        "action": "Closes",
        "slug": "group/otherproject",
        "prefix": "#",
        "issue": "22"
      },
      {
        "raw": "fixes #18",
        "action": "Fixes",
        "prefix": "#",
        "issue": "18"
      }
    ],
    "duplicate": []
  },
  "refs": [
    {
      "raw": "#17",
      "prefix": "#",
      "issue": "17"
    },
    {
      "raw": "#19",
      "prefix": "#",
      "issue": "19"
    },
    {
      "raw": "https://gitlab.com/group/otherproject/issues/23",
      "slug": "group/otherproject",
      "issue": "23"
    }
  ],
  "mentions": []
}

Expected behavior

Issue 19 and 23 should be interpreted as close.

If it helps, their parser code is at: closing_issue_extractor.rb

{
  "actions": {
    "close": [
      {
        "raw": "Fix #20",
        "action": "Fix",
        "prefix": "#",
        "issue": "20"
      },
      {
        "raw": "Fixes #21",
        "action": "Fixes",
        "prefix": "#",
        "issue": "21"
      },
      {
        "raw": "Closes group/otherproject#22",
        "action": "Closes",
        "slug": "group/otherproject",
        "prefix": "#",
        "issue": "22"
      },
      {
        "raw": "fixes #18",
        "action": "Fixes",
        "prefix": "#",
        "issue": "18"
      },
      {
        "raw": "#19",
        "prefix": "#",
        "issue": "19"
      },
      {
        "raw": "https://gitlab.com/group/otherproject/issues/23",
        "slug": "group/otherproject",
        "issue": "23"
      }
    ],
    "duplicate": []
  },
  "refs": [
    {
      "raw": "#17",
      "prefix": "#",
      "issue": "17"
    },
    {
      "raw": "#19",
      "prefix": "#",
      "issue": "19"
    },
    {
      "raw": "https://gitlab.com/group/otherproject/issues/23",
      "slug": "group/otherproject",
      "issue": "23"
    }
  ],
  "mentions": []
}

Start by running the shown text through issueParser('gitlab') and tracing its GitLab closing-action handling, using GitLab's closing_issue_extractor.rb as the comparison point. The parser should classify issue 19 and the issue 23 URL as close actions while retaining them in refs as shown.