placeholder: support setSdkRequestTimeout when invoking lambda

[glebsts]

trafficstars

According to api docs InvokeRequest does support timeout. Recently made lambda that works quite long (yes, I want those 5 mins once per day), and gradle task failed because of of invocation timeout. Then I discovered that InvokeRequest supports timeouts, so need to add that to invoker task.

Most probably will add PR myself soon, but really not sure if author has enough time to look through PRs :)