Add guest sessions

[yscik]

Changes Proposed in this Pull Request

• Add a Guest_User class to manage creation and lookup of guest users
• Add Guest_Session to 'log in' guest users

Works like this:

Guest_User( $id/$email )->create_token()

• Creates a token — this joins together the guest user id and their access token into an URL token so it's just one thing.

[ link with token gets sent out, user clicks it ]

Guest_Session::get_current_guest():

• Checks if there is a token in the URL or in a cookie
• Verifies the token, sets the guest user if it checks out
• Sets a cookie if it's a new session
• Returns the guest user object

Cookie is the same as the URL token, which keeps things simple.

Testing Instructions

• See 420-gh-Automattic/wpjm-addons for the whole flow

Release Notes

• Add support for user sessions without a full account

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