Add list template tags command

[rsrdesarrollo]

Proposed changes

Add CLI flag '-tgl' to list all the tags available on the templates (similar to -tl but for tags instead of templates)

Checklist

• [x] Pull request is created against the dev branch
• [x] All checks passed (lint, unit/integration/regression tests etc.) with my changes
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] I have added necessary documentation (if appropriate)

[olearycrew]

Thanks for this contribution @rsrdesarrollo I love this!