feat: 'issue board view' command support for group boards

Description This adds the ability to choose group level boards when viewing issue boards. Some additional flags such as label filtering are also added since the Gitlab issue boards are mainly just the column layouts including all issues in the project/group. "Opened" and "Closed" issue lists are now included in the view.

Related Issue This change was implemented while the project was on github, but was never merged due to inactivity. https://github.com/profclems/glab/issues/840
Same PR on github: https://github.com/profclems/glab/pull/893

How Has This Been Tested? Manually tested using existing group and project boards on both public and private Gitlab instances.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation
• Chore (Related to CI or Packaging to platforms)