Predict methods

[cscherrer]

Some reminders for when this is done:

1. Talk with @sethaxen when this is done about updated the Arviz quickstart (discussion in https://github.com/arviz-devs/ArviZ.jl/pull/131)
2. Update TupleVectors so Vector{<:TupleVector} is displayed more cleanly

[codecov[bot]]

Codecov Report

Merging #287 (d1ff082) into master (a17dbe7) will increase coverage by 2.51%. The diff coverage is 77.14%.

@@            Coverage Diff             @@
##           master     #287      +/-   ##
==========================================
+ Coverage   28.00%   30.52%   +2.51%     
==========================================
  Files          50       49       -1     
  Lines        1214     1199      -15     
==========================================
+ Hits          340      366      +26     
+ Misses        874      833      -41     

Impacted Files	Coverage Δ
src/Soss.jl	100.00% <ø> (ø)
src/core/models/conditional.jl	45.00% <0.00%> (-5.00%)	:arrow_down:
src/transforms/withmeasures.jl	0.00% <0.00%> (ø)
src/transforms/predict.jl	84.21% <84.21%> (+73.68%)	:arrow_up:
src/primitives/rand.jl	51.72% <100.00%> (+1.72%)	:arrow_up:
src/transforms/basictransforms.jl	100.00% <100.00%> (ø)
src/transforms/utils.jl	84.84% <100.00%> (+2.03%)	:arrow_up:
src/primitives/basemeasure.jl	82.35% <0.00%> (+1.10%)	:arrow_up:
... and 2 more

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[cscherrer]

@sethaxen with this PR, this now works for the ArviZ quickstart

julia> postpred = predict(rng, param_mod | observed_data, post)
4-element Vector{TupleVectors.TupleVector{NamedTuple{(:y,), Tuple{Vector{Float64}}}, NamedTuple{(:y,), Tuple{ArraysOfArrays.ArrayOfSimilarArrays{Float64, 1, 1, 2, ElasticArrays.ElasticMatrix{Float64, Vector{Float64}}}}}}}:
...