event_handlers: Event Handlers
In kos59125/soracomr: Management of SORACOM SIM cards

Get event handlers.

list_event_handlers(token, imsi, filter)

get_event_handler(token, handler_id)

create_event_handler(token, handler)

put_event_handler(token, handler)

delete_event_handler(token, handler_id)

`token`	Your API token.
`imsi`	Subscriber's IMSI.
`filter`	Filter condition. If both `imsi` and `filter` are present, `filter` is ignored.
`handler_id`	Handler ID.
`handler`	Event handler object.