Add object numeric destructuring for reactivity rule

[Forelyl]

PR is about making next code to pass as valid
const {0: signal, 1: signal} = createSignal(5); // ... assume later correct signal usage
const {'0': signal, '1': signal} = createSignal(5); // ... assume later correct signal usage

Reason for adding this is because array destructuring in specs is defined using iterator, for more info please check next article (not mine): https://medium.com/@P0lip/array-destructuring-revisited-a43d991d1920

[Forelyl]

Sorry, my bad missed - an unused import