info: retrieve additional metadata about apps

[n8felton]

When using mas to automate gathering information about Apps, it would be nice to be able to retrieve additional metadata such as the Description, "What's New", and Category (and potentially all the other metadata available in the "Information" section of the MAS)

Describe the solution you'd like
An updated command such as mas info or additional argument such as mas info --description and/or mas info --full to include additional App metadata

mas info --full 497799835
Xcode 12.5 [0.0]
By: Apple Inc.
Category: Developer Tools
Released: 2021-04-26
Minimum OS: 11.0
Size: 11.68 GB
From: https://apps.apple.com/us/app/xcode/id497799835?mt=12&uo=4
Description: Xcode includes everything developers need to create great applications for Mac, iPhone, iPad, Apple TV, and Apple Watch. Xcode provides developers a unified workflow for user interface design, coding, testing, and debugging. The Xcode IDE combined with the Swift programming language make developing apps easy and fun.

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New in Xcode 12.5
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[chris-araman]

It probably makes sense to implement this as part of #190.

[phatblat]

My thoughts exactly, @chris-araman. For context, @n8felton, changing output format can break scripts and tools that parse mas output. Perhaps we can combine this idea with #190 as we add more output and flags to control the format.