Drop support for pre-1.10

[Red-Portal]

• Change CI to test only on 1.10 and 1
• Remove all uses to SimpleUnPack in favor of the (; ret1, ret2) = func() syntax.
• Separate Enzyme into its own CI workflow.
• Wait until the upstream (Julia) bugfixes get shipped.

[github-actions]

Benchmark Results

Benchmark suite	Current: f206f7b	Previous: 09b81ee	Ratio
normal/RepGradELBO + STL/meanfield/Zygote	15078319781 ns	15489443300 ns	0.97
normal/RepGradELBO + STL/meanfield/ForwardDiff	3625670767 ns	3505509464 ns	1.03
normal/RepGradELBO + STL/meanfield/ReverseDiff	3395701183 ns	3247853596 ns	1.05
normal/RepGradELBO + STL/fullrank/Zygote	15116863602 ns	15235026725 ns	0.99
normal/RepGradELBO + STL/fullrank/ForwardDiff	3944226179 ns	3831033989 ns	1.03
normal/RepGradELBO + STL/fullrank/ReverseDiff	6139722083 ns	6017306487 ns	1.02
normal/RepGradELBO/meanfield/Zygote	7253389710 ns	7380650072 ns	0.98
normal/RepGradELBO/meanfield/ForwardDiff	2632993115 ns	2475600557 ns	1.06
normal/RepGradELBO/meanfield/ReverseDiff	1576403543 ns	1548041038.5 ns	1.02
normal/RepGradELBO/fullrank/Zygote	7306039560 ns	7453788446 ns	0.98
normal/RepGradELBO/fullrank/ForwardDiff	2840947231 ns	2659803352 ns	1.07
normal/RepGradELBO/fullrank/ReverseDiff	2739226599 ns	2730304200 ns	1.00
normal + bijector/RepGradELBO + STL/meanfield/Zygote	23653390745 ns	23442368232 ns	1.01
normal + bijector/RepGradELBO + STL/meanfield/ForwardDiff	9866085988 ns	8789034886 ns	1.12
normal + bijector/RepGradELBO + STL/meanfield/ReverseDiff	4849345847 ns	4756885202 ns	1.02
normal + bijector/RepGradELBO + STL/fullrank/Zygote	23305322822 ns	23276321282 ns	1.00
normal + bijector/RepGradELBO + STL/fullrank/ForwardDiff	9938549134 ns	9439366628 ns	1.05
normal + bijector/RepGradELBO + STL/fullrank/ReverseDiff	8146814462 ns	7973877978 ns	1.02
normal + bijector/RepGradELBO/meanfield/Zygote	14724622532 ns	14740241990 ns	1.00
normal + bijector/RepGradELBO/meanfield/ForwardDiff	8308024002 ns	8107084371 ns	1.02
normal + bijector/RepGradELBO/meanfield/ReverseDiff	2841611924 ns	2752578732 ns	1.03
normal + bijector/RepGradELBO/fullrank/Zygote	14769912290 ns	14777967633 ns	1.00
normal + bijector/RepGradELBO/fullrank/ForwardDiff	8231288155 ns	7966018701 ns	1.03
normal + bijector/RepGradELBO/fullrank/ReverseDiff	4313583587 ns	4273933874 ns	1.01

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 93.54%. Comparing base (0383ce6) to head (f206f7b).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #129   +/-   ##
=======================================
  Coverage   93.54%   93.54%           
=======================================
  Files          12       12           
  Lines         372      372           
=======================================
  Hits          348      348           
  Misses         24       24           

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[Red-Portal]

There was an upstream bug that got caught. For this to be fixed, we'll need to wait until Julia 1.11.2.