fix(SlashCommandBuilder): add missing shared properties (#10255)

* types(SlashCommandBuilder): add missing shared properties

* Add tests for types

* Fix formatting

* Enable Vitest type checking

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Co-authored-by: Jiralite <33201955+Jiralite@users.noreply.github.com>

vitest.config.ts

@@ -4,6 +4,10 @@ export default defineConfig({
 	test: {
 		exclude: ['**/node_modules', '**/dist', '.idea', '.git', '.cache'],
 		passWithNoTests: true,
+        typecheck: {
+            enabled: true,
+            include: ["**/__tests__/types.test.ts"]
+        },
 		coverage: {
 			enabled: true,
 			all: true,