Biomass functions as Lua

[jpy-luke]

Rewrite biomass functions migrated in #1 into a lua script file. The file should return an entry point function with signature ReferenceTree, int => list. If ReferenceTree as parameter gives trouble, alternatively do list, int => list where the parameter list contains all necessary variables from the ReferenceTree.

Create a runner function with signature ReferenceTree, int => list. It can be implemented like was done in lukefi.metsi.forestry.cross_cutting.cross_cutting_lupa.

Create Unit test for result equivalence like is done with cross_cutting implementations.

Create a wrapper function ReferenceTree, int, str => list for biomass calculation like lukefi.metsi.forestry.cross_cutting.cross_cutting.cross_cut, which is able to choose either the "py" implementation or "lupa" implementation

We'll make a Metsi application issue for taking this into use afterwards.