Add ingress settings support in firebase functions

[takaaa220]

Description

Supports firebase-functions SDK in firebase/firebase-functions#815 and firebase/firebase-functions#827

functions
  .runWith({
    ingressSettings: "ONLY_INTERNAL_ONLY",
  })
  .https.onRequest(() => {
  ...
  });

Scenarios Tested

I've created a new cloud function with specific ingressSettings and it works! and, I updated its function and it also works!

Sample Commands

No change in cli.

[samtstern]

@takaaa220 thanks for this contribution! Hopefully @joehan can take a look at firebase/firebase-functions#827 first and then review this one.

[takaaa220]

@joehan
Thank your for reviewing. I will resolve conflicts this week 🙇

[coveralls]

Coverage decreased (-0.02%) to 65.558% when pulling 93f986b on takaaa220:add-ingress-settings-support-in-firebase-functions into 67cff84 on firebase:master.