feat: workspace view for schedules (#991)

Summary:

This adds the client-side implementation to match the types introduced
in #879 and #844 as well as a card in the Workspaces page to present
workspace the data.

Details:

* Added a convenient line break in the example schedule.Weekly
* Added missing `json:""` annotations in codersdk/workspaces.go
* Installed cronstrue for displaying human-friendly cron strings
* Adjusted/Added client-side types to match codersdk/workspaces.go
* Added new component WorkspaceSchedule.tsx

Next Steps:

The WorkspaceSchedule.tsx card only presents data (on purpose). In order
to make it PUT/modify data, a few changes will be made:

- a form for updating workspace schedule will be created
- the form will wrapped in a dialog or modal
- the WorkspaceSchedule card will have a way of opening the modal which
will likely be generalized up to WorkspaceSection.tsx

Impact:

This is user-facing

This does not fully resolve either #274 or #275 (I may further decompose
that work to reflect reality and keep things in small deliverable
increments), but adds significant progress towards both.

codersdk/workspaces.go

@@ -92,7 +92,7 @@ func (c *Client) WorkspaceBuildByName(ctx context.Context, workspace uuid.UUID,
 
 // UpdateWorkspaceAutostartRequest is a request to update a workspace's autostart schedule.
 type UpdateWorkspaceAutostartRequest struct {
-	Schedule string
+	Schedule string `json:"schedule"`
 }
 
 // UpdateWorkspaceAutostart sets the autostart schedule for workspace by id.
@@ -112,7 +112,7 @@ func (c *Client) UpdateWorkspaceAutostart(ctx context.Context, id uuid.UUID, req
 
 // UpdateWorkspaceAutostopRequest is a request to update a workspace's autostop schedule.
 type UpdateWorkspaceAutostopRequest struct {
-	Schedule string
+	Schedule string `json:"schedule"`
 }
 
 // UpdateWorkspaceAutostop sets the autostop schedule for workspace by id.