[SHIPA-2964] Adds Ingress

[stinkyfingers]

Description

• adds a configmap watcher that watches for changes to configmap that stores ingress controller data
• adds GetIngress() call in app reconciler, which set's an app's ingress controller from the configmap values if the app has empty ingress values
• adds ingress set and ingress get to CLI
• unit tests
• updates acceptance (cli) tests

Fixes # 2964

TEST:
make ketch
Set up make generate manifests uninstall && make install
./bin/ketch ingress set -c nginx -s 127.0.0.1 -t nginx
./bin/ketch ingress get
./bin/ketch app deploy myapp -i gcr.io/shipa-ci/sample-go-app -n default
k get app myapp -oyaml <- see ingress fields

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)
• Chore (documentation addition or typo, file relocation)

Testing

• New tests were added with this PR that prove my fix is effective or that my feature works (describe below this bullet)
• This change requires no testing (i.e. documentation update)

Documentation

• All added public packages, funcs, and types have been documented with doc comments
• I have commented my code, particularly in hard-to-understand areas

Final Checklist:

• I followed standard GitHub flow guidelines
• I have performed a self-review of my own code
• My changes generate no new warnings

Additional Information (omit if empty)

Please include anything else relevant to this PR that may be useful to know.