Programmatic equivalent to including a code chunk with a
context in a runtime: shiny_prerendered document.
     
    
    shiny_prerendered_chunk(context, code, singleton = FALSE)
 
    
    Arguments
- context
- Context name (e.g. "server", "server-start") 
- code
- Character vector with code 
- singleton
- Collapse multiple identical versions of this
chunk into a single chunk.