feat: Move workspaces under organizations (#1109)

This removes split ownership for workspaces. They are now
a resource of organizations and have a designated owner,
which is a user.

This enables simple administration for commands like:
- `coder stop ben/dev`
- `coder build logs colin/arch`

or if we decide to allow administrators to access workspaces,
they could even SSH using this syntax: `coder ssh colin/dev`.

cli/workspaceshow.go

@@ -17,7 +17,11 @@ func workspaceShow() *cobra.Command {
 			if err != nil {
 				return err
 			}
-			workspace, err := client.WorkspaceByName(cmd.Context(), codersdk.Me, args[0])
+			organization, err := currentOrganization(cmd, client)
+			if err != nil {
+				return err
+			}
+			workspace, err := client.WorkspaceByOwnerAndName(cmd.Context(), organization.ID, codersdk.Me, args[0])
 			if err != nil {
 				return xerrors.Errorf("get workspace: %w", err)
 			}