Enable the creation of variables using @variables X(vec...)

[TorkelE]

This enables:

@variables x y z
args = [x, y, z]
@variables X(args...)

which is equivalent to

@variables X(x, y, z)

Currently, the former throws an error. This should enable people to collect e.g. independent variables in a vector, and then using it as dependencies in @variables. This will also fix a problem in Catalyst where we no longer can creat observables correctly.

[TorkelE]

Uncertain if this is the correct test file, but the best one I found. happy to move elsewhere/create a new file.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.00%. Comparing base (5af597a) to head (7417bfe).
Report is 26 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1365       +/-   ##
===========================================
+ Coverage    3.98%   79.00%   +75.02%     
===========================================
  Files          50       51        +1     
  Lines        4771     4882      +111     
===========================================
+ Hits          190     3857     +3667     
+ Misses       4581     1025     -3556     

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