Co-authored-by: Natalie <nat@metabase.com>

* respect `remember` field on backend if session tokens are not enforced via env variable

* modify docs to describe new behavior

* fix indentation

* use get-in to access remember field of request

* add a session api test

* expose session-cookies as a public setting

* hide remember me checkbox if session-cookies is set

* Session expiration dox [ci skip]

* Update example using Java system property [ci skip]

* Style tweak [ci skip]

* Fix typo [ci skip]