Improves streamer logic for multiple jaggednes

[tamasgal]

This adds support for triply jagged stuff, which is buried as vector<something> inside nested classes.

Currently only int32 and double is implemented and this needs a bigger refactoring, now that I understand a bit better a few more edge-cases.

I'll go ahead with the merge since it does not affect the existing functionality. It's clear that the implementation is suboptimal but everything is typesafe, we just need to redesign the Jagg-type-system to e.g. use parametric types for the jaggedness or so.

With this patch, KM3NeT offline ROOT files (simulation and reco) are now fully readable ;)

julia> f = UnROOT.samplefile("triply_jagged_via_custom_class.root");

julia> b = LazyBranch(f, "E/Evt/trks/trks.fitinf");

julia> typeof(b)
LazyBranch{SubArray{Vector{Float64}, 1, Vector{Vector{Float64}}, Tuple{UnitRange{Int64}}, true}, UnROOT.Offset6jaggjagg, ArraysOfArrays.VectorOfVectors{Vector{Float64}, Vector{Vector{Float64}}, Vector{Int32}, Vector{Tuple{}}}}

julia> b[2][3]
8-element Vector{Float64}:
   0.006795213995646554
   0.004663009290056574
 -78.11879123256927
  60.0
   0.0
   0.0
   2.164796367611156
  39.0

[codecov]

Codecov Report

Patch coverage: 93.33% and project coverage change: +0.76 🎉

Comparison is base (4ee582e) 88.14% compared to head (e82d2cd) 88.91%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #231      +/-   ##
==========================================
+ Coverage   88.14%   88.91%   +0.76%     
==========================================
  Files          18       18              
  Lines        2126     2147      +21     
==========================================
+ Hits         1874     1909      +35     
+ Misses        252      238      -14     

Impacted Files	Coverage Δ
src/utils.jl	96.15% <90.90%> (-3.85%)	⬇️
src/root.jl	94.54% <94.73%> (+0.33%)	⬆️

... and 1 file with indirect coverage changes

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[Moelf]

wtf hahaha?

[tamasgal]

Yeah sorry 🤣