[RangeDatePicker]: add onFocus and onBlur props

[AlekseyManetov]

To Do

Add onFocus and onBlur props for RangeDatePicker component.

Describe the solution you'd like (optional)

This props will have such signature: (e: Event, inputType: 'from' | 'to') => void. Call this props inside current handleFocus and handleBlur methods.