🗄️ Split PlutoRunner into files

src/runner/PlutoRunner/README.md

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+This module will be evaluated _inside_ the workspace process.
+
+Pluto does most things on the server, but it uses worker processes to evaluate notebook code in.
+These processes don't import Pluto, they only import this module.
+Functions from this module are called by WorkspaceManager.jl via Malt.
+
+When reading this file, pretend that you are living in a worker process,
+and you are communicating with Pluto's server, who lives in the main process.
+The package environment that this file is loaded with is the NotebookProcessProject.toml file in this directory.
+
+# SOME EXTRA NOTES
+
+1. The entire PlutoRunner should be a single file.
+2. Restrict the communication between this PlutoRunner and the Pluto server to only use *Base Julia types*, like `String`, `Dict`, `NamedTuple`, etc. 
+
+These restriction are there to allow flexibility in the way that this file is
+loaded on a runner process, which is something that we might want to change
+in the future.
+
+# DEVELOPMENT TIP
+If you are editing this file, you cannot use Revise unfortunately.
+However! You don't need to restart Pluto to test your changes! You just need to restart the notebook from the Pluto main menu, and the new PlutoRunner.jl will be loaded.