Use concrete types for objective states

[Red-Portal]

No description provided.

[github-actions]

AdvancedVI.jl documentation for PR #196 is available at:
https://TuringLang.github.io/AdvancedVI.jl/previews/PR196/

[github-actions]

Benchmark Results

Benchmark suite	Current: dfbd0d5	Previous: 5899b9d	Ratio
normal/RepGradELBO + STL/meanfield/Zygote	3777665233.5 ns	3846801299 ns	0.98
normal/RepGradELBO + STL/meanfield/ReverseDiff	1119097900 ns	1122672279 ns	1.00
normal/RepGradELBO + STL/meanfield/Mooncake	1164296216 ns	1194022172 ns	0.98
normal/RepGradELBO + STL/fullrank/Zygote	3791410514 ns	3837266295.5 ns	0.99
normal/RepGradELBO + STL/fullrank/ReverseDiff	1613534098 ns	1627490078 ns	0.99
normal/RepGradELBO + STL/fullrank/Mooncake	1230978338 ns	1264100546.5 ns	0.97
normal/RepGradELBO/meanfield/Zygote	2661873907 ns	2717993174.5 ns	0.98
normal/RepGradELBO/meanfield/ReverseDiff	774080455 ns	779249645 ns	0.99
normal/RepGradELBO/meanfield/Mooncake	1053374683 ns	1074763668 ns	0.98
normal/RepGradELBO/fullrank/Zygote	2672608788.5 ns	2717729021 ns	0.98
normal/RepGradELBO/fullrank/ReverseDiff	950740840 ns	955058566.5 ns	1.00
normal/RepGradELBO/fullrank/Mooncake	1111000209 ns	1110439156 ns	1.00
normal + bijector/RepGradELBO + STL/meanfield/Zygote	5475442650 ns	5378575476 ns	1.02
normal + bijector/RepGradELBO + STL/meanfield/ReverseDiff	2372688390 ns	2388521892 ns	0.99
normal + bijector/RepGradELBO + STL/meanfield/Mooncake	4015994600 ns	4086302816 ns	0.98
normal + bijector/RepGradELBO + STL/fullrank/Zygote	5437878431 ns	5522262867 ns	0.98
normal + bijector/RepGradELBO + STL/fullrank/ReverseDiff	2969613238 ns	3025862858.5 ns	0.98
normal + bijector/RepGradELBO + STL/fullrank/Mooncake	4145545443 ns	4203854686.5 ns	0.99
normal + bijector/RepGradELBO/meanfield/Zygote	4322745187 ns	4294074936.5 ns	1.01
normal + bijector/RepGradELBO/meanfield/ReverseDiff	1973172729 ns	2006547098 ns	0.98
normal + bijector/RepGradELBO/meanfield/Mooncake	3858044220.5 ns	3947271632.5 ns	0.98
normal + bijector/RepGradELBO/fullrank/Zygote	4369498318 ns	4392815274.5 ns	0.99
normal + bijector/RepGradELBO/fullrank/ReverseDiff	2281203503 ns	2277825314 ns	1.00
normal + bijector/RepGradELBO/fullrank/Mooncake	3943973596 ns	4017866281 ns	0.98

This comment was automatically generated by workflow using github-action-benchmark.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.47%. Comparing base (c3ddbac) to head (dfbd0d5).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #196      +/-   ##
==========================================
- Coverage   88.98%   87.47%   -1.52%     
==========================================
  Files          18       18              
  Lines         445      447       +2     
==========================================
- Hits          396      391       -5     
- Misses         49       56       +7     

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