Support for Session Cookies

[KgotsoK]

1. Which version of kreait/firebase-php are you using?

4.8.0

2. Which version of PHP are you using?

7.1

3. What's the issue?

Can we have support for Session Cookies:
https://firebase.google.com/docs/auth/admin/manage-cookies

It really simplifies Firebase Auth on stateful sites.

4. Code that lead to the issue

N/A

[jeromegamez]

Please don‘t think that I‘m ignoring your feature request - I‘ve already looked at a possible implementation but am hesitating a little because working with cookies adds a fair bit of complexity and I‘m trying to do this right from the start. Stay tuned :)

[KgotsoK]

Thanks @jeromegamez . Glad to know you're playing with the idea. looking forward to it.

[jeromegamez]

@KgotsoK @TheMrG @slapbox @marcus-at-localhorst I finally got around to start working on this in #244 - it would be great if you could try it out and tell me if and how that works for you \o/

[Nantris]

Unfortunately I'm not in a position to test currently, but this sounds like a great development!

[cosmini]

Any updates on this?