Template discoverability improvements (azd template list, azd init, azd template show)

[Austinauth]

Issue description

There are substantial issues and opportunities for improvement for the azd template list, azd template show and azd init experiences. This issue tracks a workstream focused on improving the aforementioned commands.

Examples

A detailed write up on pain points, open questions and more can be found in this Figjam.

azd template list

azd template show

azd init