Remove dependency on DynamicPPL

[sunxd3]

fix #206

[github-actions]

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	5.5084	8.142	7208.56	92.612
pumps	12	10	1.00876	1.44219	184.294	6.71975
dogs	2	720	NA	NA	3920.58	161.972
seeds	26	21	2.44542	3.20094	689.059	21.781
surgical_realistic	14	12	1.28852	1.72403	240.247	9.00333
magnesium	108	96	10.475	12.1875	9727.02	90.218
salm	22	18	2.37345	3.07911	507.1	13.2245
equiv	15	20	2.47555	3.44763	379.157	15.819
dyes	9	30	0.980167	1.32382	252.701	13.6055
stacks	6	21	1.14215	1.67589	309.257	14.937
epil	303	236	33.472	38.873	68533.9	324.13
blockers	47	44	3.30625	3.76414	2120.03	32.751
oxford	244	240	16.14	18.735	54958.3	202.888
lsat	1006	5000	181.459	222.826	3.15041e6	1645.79
bones	33	422	72.605	91.1	14576.4	195.585
mice	20	65	7.3385	9.25067	1075.1	43.902
kidney	64	58	10.64	16.15	3824.87	78.296
leuk	18	714	20.438	26.87	9715.78	243.454
leukfr	40	714	24.255	31.87	19139.3	253.137

[coveralls]

Pull Request Test Coverage Report for Build 11271788411

Details

• 105 of 147 (71.43%) changed or added relevant lines in 10 files are covered.
• 57 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-3.5%) to 77.929%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
ext/JuliaBUGSAdvancedMHExt.jl	0	3	0.0%
src/model.jl	54	62	87.1%
ext/JuliaBUGSDynamicPPLExt.jl	0	14	0.0%
src/utils.jl	9	26	34.62%

Files with Coverage Reduction	New Missed Lines	%
src/parser/bugs_macro.jl	1	76.85%
ext/JuliaBUGSAdvancedMHExt.jl	1	28.57%
src/compiler_pass.jl	6	93.94%
src/model.jl	8	83.66%
src/BUGSExamples/BUGSExamples.jl	41	0.0%

Totals
Change from base Build 11210106726:	-3.5%
Covered Lines:	1377
Relevant Lines:	1767

---

💛 - Coveralls

[sunxd3]

@yebai I am merging this now, there might be corner cases DynamicPPL handles and I have not integrated yet, will fix those as we go