Create simple "CFM" bot

[davidsiska-vega]

The aim is to create a simple CFM bot that will place volume according to the $xy=k$ formula.

The logic should be the following:

• work out the volume at each tick between one tick from last traded price to min / max implied by the lpPriceRange parameter.
• at each time step it should cancel all it's old volume and dump new volume on the book.
• Use $xy = k_b$ for incoming buy orders and $xy = k_s$ for incoming sell orders with $k_b$ and $k_s$ adjusted based on position size, so that "if I am already short buy orders get a bad price from me but sell orders get a good price from me".

Context: we want to get a feeling for how this: vegaprotocol/specs#1990 would work.

Follow up: once this is done we'll do a ticket for a Uniswap v3 type curve. One step at a time.

[davidsiska-vega]

How much volume should be implied: there is an example here: https://docs.google.com/spreadsheets/d/1sb-oS9V5qcMDLy2YVoUrXmZZpJqZLBYzR8B2mi68Tas/edit?usp=sharing

[davidsiska-vega]

Section 2 here has some of the background blah-blah: https://github.com/vegaprotocol/research-internal/blob/master/cash-settl-fut-cpm/cash-settl-fut-cpm.tex