Migrate teraslice processors

[jsnoble]

• move stdout and script processors from teraslice to standard-assets

[godber]

Are there any docs we can move over? A quick scan of this assets docs it looks like we'd want to add stdout to the top level README.md and then link to a markdown file in the docs directory with a little detailed info about the processor.

[busma13]

Are there any docs we can move over? A quick scan of this assets docs it looks like we'd want to add stdout to the top level README.md and then link to a markdown file in the docs directory with a little detailed info about the processor.

There is something in teraslice/docs/jobs/builtin-operations.md