fix (breaking-change): remove flags for event templates and events deploy / undeploy hooks

[sangeetha5491]

Description

Breaking Change:

Removes the old implementation of aio app add events, and uses events templates instead Runs pre and post event reg hook on deploy and undeploy Delete aio app delete event command => since events command no longer deals with publish action

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] 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.
• [x] My change requires a change to the documentation.
• [x] 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 #732 (aaa81d6) into master (814908d) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #732   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           57        56    -1     
  Lines         3229      3186   -43     
  Branches       607       598    -9     
=========================================
- Hits          3229      3186   -43     

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

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