feat(vue): expand @robonen/vue composable collection

Composables, tests, category barrels, and README for @robonen/vue.

vue/toolkit/src/composables/animation/index.ts

@@ -0,0 +1,12 @@
+export * from './useAnimate';
+export * from './useCountdown';
+export * from './useDateFormat';
+export * from './useInterval';
+export * from './useIntervalFn';
+export * from './useNow';
+export * from './useRafFn';
+export * from './useTimeAgo';
+export * from './useTimeout';
+export * from './useTimeoutFn';
+export * from './useTimestamp';
+export * from './useTransition';