Allow to execute Y.js and Insight together

[JaroslavTulach]

Since the implementation of reload insight script on file change we have a nice and comfortable way to execute Enso Insight scripts like Detect Assign Statements in the IDE and observe how engine executes the code.

The next step is to connect Y.js and Insight together. Let's do it like this:

• modify ContextInsightSetup to emulate necessary JS environment
• the emulation has already been written and is part of ydoc-server module.
• make sure the emulation is also initialized in ContextInsightSetup via the epb language:

    var epbSrc =
        Source.newBuilder("epb", path.toFile())
            .content("js:0#" + codeToExecute)
            .build();

It is essential to use epb language as it sets a proper inner context for JavaScript rather than trying to execute JavaScript directly (as it is not ready for multi threaded access).

At the end please demonstrate how a simple script showing co-operation between Enso Insight and Y.js structures can be created and used in the IDE via -Denso.dev.insight property.