command-line execution of yaml execution chains

[jaromil]

The .yml files are now executed only by a running restroom-mw via its API, it is very useful to test them via command-line without starting restroom. This CLI tool may be done quickly in Go by ignoring the restroom-mw extended zencode statements, or exporting in Typescript the part of restroom that does the execution and trying to implement one that is not a middleware but a CLI tool.