Split cookies string w/ jest tests

[chrusart]

Set-Cookie header returned by few frameworks is a one string of comma separated cookie strings.
This PR adds method to split this string into array of separate cookie strings.
Handles commas in parameters like expires.

e.g. string:

"cid=70125eaa-399a-41b2-b235-8a5092042dba; expires=Thu, 04-Jun-2020 12:17:56 GMT; Max-Age=63072000; Path=/, client_id=70125eaa-399a-41b2-b235-8a5092042dba; Max-Age=63072000; Path=/; expires=Thu, 04-Jun-2020 12:17:56 GMT"

to array:

[
"cid=70125eaa-399a-41b2-b235-8a5092042dba; expires=Thu, 04-Jun-2020 12:17:56 GMT; Max-Age=63072000; Path=/",
"client_id=70125eaa-399a-41b2-b235-8a5092042dba; Max-Age=63072000; Path=/; expires=Thu, 04-Jun-2020 12:17:56 GMT",
]

Maybe it will better fit to set-cookie-parser library?

[chrusart]

I honestly think it should go to set-cookie-parser as it fits much better there.
I'm closing, react-native-cookies could use set-cookie-parser when needed.