feat(list): add issue list output formatting

Description

Add options to format issue list output as either bare IIDs or web URLs.

This allows for easy chaining of CLI commands like:

glab issue list ... | xargs glab issue update ...

or

glab issue list ... | xargs -n 1 glab issue view

How has this been tested?

manually and via unit tests

Screenshots (if appropriate):

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)