[WIP] pit_cell implemented as lambda function.

[sunayana]

No description provided.

[shortcut-integration]

This pull request has been linked to Shortcut Story #39927: Improve wrapping of C++ code.

[sunayana]

This strategy maybe less than ideal but it works for the moment to at least see the values in the Depression{Float64} struct

julia> using RichDEM
[ Info: Precompiling RichDEM [db566695-6f60-45f3-9b37-d3ff769e9aca]
[ Info: Skipping precompilation since __precompile__(false). Importing RichDEM [db566695-6f60-45f3-9b37-d3ff769e9aca].
Warning: Type i already had a mapped type set as Int32 using hash 6253375586064260614 and const-ref indicator 0
Warning: Type a already had a mapped type set as Int8 using hash 4993892634952068459 and const-ref indicator 0
Warning: Type j already had a mapped type set as UInt32 using hash 10485857595211860659 and const-ref indicator 0

julia> dep = RichDEM.depressions.Depression{Float64}()
RichDEM.depressions.DepressionAllocated{Float64}(Ptr{Nothing} @0x0000000001cb0280)

julia> RichDEM.depressions.pit_cell(dep)
0xffffffff