This commit adds the following changes to workspace scheduling behaviour:
* CLI: updating a workspace TTL updates the deadline of the workspace.
* If the TTL is being un-set, the workspace deadline is set to zero.
* If the TTL is being set, the workspace deadline is updated to be the last updated time of the workspace build plus the requested TTL. Additionally, the user is prompted to confirm interactively (can be bypassed with -y).
* UI: updating the workspace schedule behaves similarly to the CLI, showing a message to the user if the updated TTL/time to shutdown would effect changes to the lifetime of the running workspace.
* fix: Remove unused workspace routes in favor of list with filter
This consolidates the workspace routes into a single place.
It allows users to fetch a workspace by their username and
workspace name, which will be used by the frontend for routing.
* Fix RBAC
* Fix CLI usages
* Changes all public-facing codersdk types to use a plain int64 (milliseconds) instead of time.Duration.
* Makes autostart_schedule a *string as it may not be present.
* Adds a utils/ptr package with some useful methods.
