AQL timezone extension (#396)

* Add timezone parameter to functions, examples, formatting

* Add examples and descriptions

* Release notes

* Fix example name

* [skip ci] Automatic commit of generated files from CircleCI

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Co-authored-by: CircleCI <circleci@ip-10-0-64-25.ec2.internal>
Co-authored-by: CircleCI Job <daniele@arangodb.com>

Author: 3 people