Add streams prefix to project and examples artifactIds

It would be better if the project and example modules which do not
have an artifactId prefixed with "streams-" are updated to use such prefix.

Now there are for example the flink-twitter-collection-0.5-incubating,
google-gplus-0.5-incubating, etc. modules (6 modules in total) which produce
artifacts that IMO are confusing for downstream users what originating project
they 'belong' to.
And as result their embedded NOTICE and DISCLAIMER files contain a confusing
(generated) statement like:

google-gplus
Copyright 2017 The Apache Software Foundation

By correcting the artifactIds to for example streams-provider-google-gplus this
would yield the more clear/correct:

streams-provider-google-gplus
Copyright 2017 The Apache Software Foundation