Improve graph library

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BridgeStan not found at location specified by $BRIDGESTAN environment variable, downloading version 2.5.0 to /home/runner/.bridgestan/bridgestan-2.5.0
Done!
Model dogs produces error: ErrorException("log_density() failed with exception: Exception: bernoulli_lpmf: Probability parameter is inf, but must be in the interval [0, 1] (in '/home/runner/work/JuliaBUGS.jl/JuliaBUGS.jl/benchmark/stan-example-models/bugs_examples/vol1/dogs/dogs.stan', line 37, column 6 to line 38, column 62)\n")

Model	Parameter Count	Data Count	Stan Density Time (µs)	Stan Density Gradient Time (µs)	JuliaBUGS Density Time with Graph Walk (µs)	JuliaBUGS Density Gradient Time with ReverseDiff.jl(compiled tape) (µs)
rats	65	150	5.5564	8.29533	8004.29	91.1555
pumps	12	10	1.02118	1.34159	178.744	6.9805
dogs	2	720	NA	NA	3141.5	197.279
seeds	26	21	2.43818	3.098	716.91	20.469
surgical_realistic	14	12	1.28674	1.68376	242.479	9.037
magnesium	108	96	10.64	12.388	11064.5	89.667
salm	22	18	2.38867	3.15033	539.879	13.7305
equiv	15	20	2.47383	3.40013	429.633	16.26
dyes	9	30	1.01439	1.35709	274.934	13.595
stacks	6	21	1.15136	1.70318	336.799	14.6925
epil	303	236	32.982	39.043	76797.7	279.137
blockers	47	44	3.23711	3.89225	2178.15	36.938
oxford	244	240	16.28	20.539	53727.8	213.8
lsat	1006	5000	182.04	220.142	3.37605e6	1652.19
bones	33	422	72.255	89.9435	13136.6	209.411
mice	20	65	7.37625	9.45433	1105.51	47.178
kidney	64	58	10.745	16.451	4002.55	77.795
leuk	18	714	20.629	26.821	10112.0	205.695
leukfr	40	714	23.574	31.829	20502.9	254.65