feat: 🎸 allow user to customize format with issues

[LiJiahaoCoder]

This PR allows users to customize format with issues, and Close: #issue will not show in commit message if users have configured issues in format. Just as test case in PR:

it('does not include emoji, if emojis disabled in config (with issues)', () => {
  const message = formatCommitMessage({
    ...defaultState,
    answers: {
      ...defaultState.answers,
      issues: '#123'
    },
    config: {
      ...defaultConfig,
      disableEmoji: true,
      format: '{issues} {type}: {subject}'
    }
  });

  expect(message).equal('#123 feat: First commit');
});

If users don't configure issues in format, the result will be:

it('does not include emoji, if emojis disabled in config (without issues)', () => {
  const message = formatCommitMessage({
    ...defaultState,
    answers: {
      ...defaultState.answers,
      issues: '#123'
    },
    config: {
      ...defaultConfig,
      disableEmoji: true
    }
  });

  expect(message).equal('feat: First commit\n\nClosed: #123');
});

[AbdealiLoKo]

Any lluck in getting this merged ? Would be great to have this

[nigelbro]

Can we get this merged?

[Nunnius]

@streamich Can we get this merged?