Add Java interface for the Inspect library

[EthanEChristian]

From a question in the Google group, it seems we might want to expose a Java interface over the inspect functionality.

As a first pass this would likely be labeled as an experimental API and subject to change at any moment.

[WilliamParker]

+1 this could be useful. Some points for consideration:

• Would we want a typical Java approach of having various classes represent the data returned or just Java maps say with keywords transformed to strings?
• How would Clojure expressions of rule conditions etc. be handled? I'm guessing by transformation to strings.

Also we wouldn't necessarily need to support all parts of inspection at first - it could be done incrementally I think.