Support user-id syntax

[srajiang]

Description

As suggested in #41, this action could support the following syntax of user-id for improved clarity. Currently channel-id accepts either a Slack CHANNEL_ID or USER_ID.

- name: Post to a Slack channel
  id: slack
  uses: slackapi/slack-github-action@v1.16.0
  with:
    user-id: 'USER_ID' # currently channel-id field accepts either CHANNEL_ID or USER_ID
    slack-message: 'posting from a github action!'
  env:
    SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}

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• I've searched for any related issues and avoided creating a duplicate issue.

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[zimeg]

🙏 Closing in favor of using chat.postMessage to send a DM, released with @2.0.0:

- name: Send a direct message
  uses: slackapi/slack-github-action@v2.0.0
  with:
    method: chat.postMessage
    token: ${{ secrets.SLACK_BOT_TOKEN }}
    payload: |
      channel: ${{ secrets.SLACK_USER_ID }}
      text: "Sending all the best"