[Python Simulator] Color code the terminal output

[Olshansk]

Objective

Colour code the terminal output of the python simulator, so it is easier to see which nodes are involved in message gossip, and how frequently.

Origin Document

The current output of the Python Simulator outputs a visual to terminal to display how messages are gossiped as seen in the output below. By color coding val_1, ..., val_n at every single height, it'll be easier to see which nodes are involved at every step.

//                                val_1
//           ┌──────────────────────┴────────────┬────────────────────────────────┐
//         val_4                               val_1                            val_7
//   ┌───────┴────┬─────────┐            ┌───────┴────┬─────────┐         ┌───────┴────┬─────────┐
// val_6        val_4     val_8        val_3        val_1     val_5     val_9        val_7     val_2

Goals

• A starter task into the python simulator for a new engineer to familiarize themselves with the codebase
• Improve simulator output visualisation for debugging purposes

Deliverable

• A PR where the terminal output results in val_XXX being the same color at every height of the tree

Non-goals / Non-deliverables

• Changing the RainTree algorithm
• Implementing the Redundancy or Cleanup layer in the simulator

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Creator: @Olshansk