Implement authentication timeout. (Azuka#12)

* Support auth expiry.

* Support multiple keycloak versions in integration tests.

* Implement possible auth types.

New Realm Service (Azuka#7)

* add read, update, and delete Realms

* Update build and imports, request templates. (Azuka#8)

* Update issue templates

* add read, update, and delete Realms

* Update build and imports, request templates. (Azuka#8)

* add read, update, and delete Realms

* Remove uuid from tests.

* add read, update, and delete Realms

* add read, update, and delete Realms

* Fix build.

Update build and imports, request templates. (Azuka#8)