feat(commands): add selection commands

commands/index.ts

@@ -4,6 +4,8 @@ export type { CommandId, CommandPayloads } from "./payloads";
 export { createCommandDispatcher } from "./dispatcher";
 export type { CommandRegistry } from "./registry";
 export { createCommandRegistry } from "./registry";
+export { selectionAddLayerCommand, selectionClearCommand, selectionCommands, selectionSetCommand } from "./selection";
+export type { SelectionAddLayerPayload, SelectionSetPayload } from "./selection";
 export {
   viewportCommands,
   viewportPanCommand,