fix: fix searching inside callable symbolics in get_variables!

[AayushSabharwal]

Close #1351

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Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.99%. Comparing base (5af597a) to head (0514859).
Report is 18 commits behind head on master.

Files with missing lines	Patch %	Lines
ext/SymbolicsLuxExt.jl	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1361       +/-   ##
===========================================
+ Coverage    3.98%   78.99%   +75.01%     
===========================================
  Files          50       51        +1     
  Lines        4771     4880      +109     
===========================================
+ Hits          190     3855     +3665     
+ Misses       4581     1025     -3556     

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[AayushSabharwal]

Lux seems to have broken this extension pretty badly. The outputsize internals changed in LuxDL/Lux.jl#1069 which is causing all of this.

[SebastianM-C]

Yeah, we might have to overload other things, to get the output size correctly.