feat: add API/SDK support for autostop extension (#1778)

* Adds deadline column to workspace_builds, associated DB/API plumbing
* database: Upon inserting a row into workspace_builds, deadline will 
  initially be zero.
* autobuild: Executor now checks the Deadline field of the workspace_build
  for the purpose of autostop logic.
* coderd: Adds a new route /api/v2/workspaces/:workspace/extend which allows
  updating the deadline of the currently active workspace build. The new
  deadline must be after the existing deadline, and not the zero time.
* provisionerd: updates workspace_build.deadline upon successful workspace 
  build completion (equal to now plus workspace TTL, if it exists).

site/src/api/typesGenerated.ts

@@ -216,6 +216,11 @@ export interface ProvisionerJobLog {
   readonly output: string
 }
 
+// From codersdk/workspaces.go:182:6
+export interface PutExtendWorkspaceRequest {
+  readonly deadline: string
+}
+
 // From codersdk/roles.go:12:6
 export interface Role {
   readonly name: string
@@ -423,6 +428,7 @@ export interface WorkspaceBuild {
   readonly transition: WorkspaceTransition
   readonly initiator_id: string
   readonly job: ProvisionerJob
+  readonly deadline: string
 }
 
 // From codersdk/workspaces.go:64:6
@@ -430,7 +436,7 @@ export interface WorkspaceBuildsRequest extends Pagination {
   readonly WorkspaceID: string
 }
 
-// From codersdk/workspaces.go:180:6
+// From codersdk/workspaces.go:200:6
 export interface WorkspaceFilter {
   readonly OrganizationID: string
   readonly Owner: string