add flag for computing p(x|y) in conditional HINT

[mloubout]

@alisiahkoohi sorry had to fix someone's account whcih messed up the branches, so reopening. Feel free to close it if not needed anymore

[codecov[bot]]

Codecov Report

Merging #41 (d8fc989) into master (fc5ebc9) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage   85.77%   85.78%   +0.01%     
==========================================
  Files          31       31              
  Lines        2509     2512       +3     
==========================================
+ Hits         2152     2155       +3     
  Misses        357      357              

Impacted Files	Coverage Δ
src/conditional_layers/conditional_layer_hint.jl	94.85% <100.00%> (ø)
src/layers/invertible_layer_actnorm.jl	87.50% <100.00%> (ø)
src/layers/invertible_layer_basic.jl	90.78% <100.00%> (ø)
src/layers/invertible_layer_hint.jl	92.82% <100.00%> (ø)
...rc/networks/invertible_network_conditional_hint.jl	89.38% <100.00%> (ø)
src/utils/parameter.jl	61.11% <100.00%> (+1.69%)	:arrow_up:

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[alisiahkoohi]

Will get back to this later this week.