CORS on V2 Functions

[oudmane]

In v2, cors param on https.onCall should accept cors.CorsOptions object like on v1, the frontend app keeps sending check for CORS (OPTIONS) before every request because there isn't no maxAge set.
I can make a pull request for this, let me know what you think.

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[MNITD]

+1 for the feature for the same reason mentioned in the issue:

the frontend app keeps sending check for CORS (OPTIONS) before every request because there isn't no maxAge set.