Abstraction for cookies and cookie collections

[paulbalandan]

Description
This introduces a new Cookie class and the CookieStore for holding a collection of cookies.

• A CookieInterface defines the basic methods for all HTTP cookies.
• A CloneableCookieInterface, which extends CookieInterface defines methods of an immutable HTTP cookie.
• A Cookie implementing CloneableCookieInterface representing an immutable HTTP cookie object.
• A CookieStore represents an immutable collection of Cookie objects.

Supersedes #4092 .
Replaces and closes #3983 .

Checklist:

• Securely signed commits
• Component(s) with PHPdocs
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[WinterSilence]

you can rewrite my solution if don't want read manuals..

[paulbalandan]

you can rewrite my solution if don't want read manuals..

Before posting this PR, I've read the php manual on this as well as the relevant RFCs. I've even consulted MDN for latest behavior of modern browsers for cookies. So I'd say this is researched and not just simply putting some code.

[michalsn]

Really good job. I like how it looks - well thought out.

Not sure if this kind of change should target the PATCH version... but we don't really know what version the next release will have, so I guess it's okay.

[lonnieezell]

This can be merged, right?

[paulbalandan]

Thanks for the reviews. @lonnieezell , I just have some minor phpdoc revisions to do later this day and I'll merge this right after.