Allow users to set the zone for NAT gateway

[rna-afk]

Allow users to set the zone they need the created
NAT gateway to use. ASO allows the NAT gateway to
be set to a zone so enabling that here.

What type of PR is this?
/kind feature

What this PR does / why we need it:

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• cherry-pick candidate

Release note:

Adding a zone field to the NAT Gateway spec to allow users to specify the zone in which the created NAT Gateway needs to reside in.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: rna-afk / name: Aditya Narayanaswamy (359ba16)

[k8s-ci-robot]

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[k8s-ci-robot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.84%. Comparing base (7194cbd) to head (359ba16).
Report is 58 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5738      +/-   ##
==========================================
- Coverage   52.84%   52.84%   -0.01%     
==========================================
  Files         278      278              
  Lines       29610    29612       +2     
==========================================
  Hits        15647    15647              
- Misses      13146    13148       +2     
  Partials      817      817              

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[mboersma]

/ok-to-test

[rna-afk]

/retest