Migrating "Addons" to generic handler

[bfoley13]

Description

This migrates the ingress template to the generic handler. There are some CLI specific logic that will be moved to cmdhelpers for now until we plan out a path for better CLI handling.

The necessary fields were added to the ingress draft.yaml with the defaults being added to keep the same CLI experience.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Refactor

How Has This Been Tested?

Provide instructions so we can reproduce, and list any relevant details for your test configuration. Please mention if this is a breaking change which will impact consuming tool(s).

• Unit Test:
• E2E Test:

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[bosesuneha]

lgtm