[Feature Request] Reactive Filters

### I am opening an issue for
vue-easytable

### Issue Type
Feature

### Issue Title
Reactive Filters

### What problem does this feature solve?
Adds an option for filters to apply immediately once checked. Currently the user must click "Confirm" to apply the filter.

### What does the proposed API look like?
Add a key to the `filter` object named `useConfirm` that stores true/false. If true, use the current behavior. If false, when the user checks/unchecks a filter, the filter is immediately applied.