Split handler path and name at the last dot

# This is a Feature Proposal

## Description

Actually handler path and name split at first dot. handler names like "my.nice.handler.js" are not possible. 
see: https://github.com/serverless/serverless/blob/f62116cecfc4cf9b1e000a141217a9796efbad1c/lib/plugins/aws/invokeLocal/index.js#L121

Similar or dependent issues: Not found
