add default nic configuration as cli args

[OliverMKing]

Description

Exposes default nic configuration options through cli args. There's four options

• standard. The current experience which doesn't overwrite any LB annotations on the NIC. This is mostly used for migration purposes so we can decide when to turn on this new experience.
• public. Forces the NIC to use a public LB
• private. Forces the NIC to use a private LB
• off. Doesn't reconcile the default NIC at all. Customers will be fully responsible for their NIC resource lifecyces.

Type of change

Please delete options that are not relevant.

• [ ] 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 not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Locally, unit, e2e

Checklist:

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

[coveralls]

Pull Request Test Coverage Report for Build 8526332773

Details

• 41 of 44 (93.18%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 80.285%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/controller/controller.go	0	1	0.0%
pkg/controller/nginxingress/default.go	16	18	88.89%
<!--	Total:	41	44	93.18%	-->

Totals
Change from base Build 8513632941:	0.2%
Covered Lines:	2871
Relevant Lines:	3576

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💛 - Coveralls

[OliverMKing]

/ok-to-test sha=74eb669