Update aio app add events to fetch events templates from Template Registry

[sangeetha5491]

Implement aio app add event/events to fetch Event related templates from Template registry

Description

Template selection criteria: ['events', 'helper-template'] Events template require an addtional template option: 'full-key-to-events-manifest' skip prompt is set to false always for events templates since it will otherwise fail to install the template, and there can be no default values except for registration name and description when it comes to events templates.

This new feature for template selection for events is enabled only on passing the --allowEventsTemplates flag. This is a temporary flag that will be removed once the events templates are ready to be enabled. On setting the flag to false, the old implementation of installing publish-actions will continue to work as before.

Related Issue

https://github.com/adobe/generator-add-publish-events https://github.com/adobe/generator-add-events-generic

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #710 (9bfc568) into master (1aa5f5d) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #710   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           57        57           
  Lines         3169      3199   +30     
  Branches       596       603    +7     
=========================================
+ Hits          3169      3199   +30     

Files Changed	Coverage Δ
src/BaseCommand.js	100.00% <100.00%> (ø)
src/commands/app/add/event.js	100.00% <100.00%> (ø)

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