Adds the easy autoloop function which executes a budget update and the
best easy-autoloop swap. The easy-autoloop function re-uses functions
used in the normal autoloop that relate to on-going swaps and traffic
summary.
This commit refactors the method `manager.SetParameters` to take a
`SetLiquidityParamsRequest`. As we'll see in the following commit, this
will enable us saving the params to disk more easily.