Allow passing methods with dependencies by reference

[philippjfr]

When I implemented passing parameters and functions by reference to components constructors I had not considered methods on Parameterized objects.

• Add tests

[codecov]

Codecov Report

Merging #4603 (19b2328) into main (872c136) will increase coverage by 0.01%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##             main    #4603      +/-   ##
==========================================
+ Coverage   83.73%   83.74%   +0.01%     
==========================================
  Files         260      260              
  Lines       37036    37103      +67     
==========================================
+ Hits        31012    31073      +61     
- Misses       6024     6030       +6     

Flag	Coverage Δ
ui-tests	39.57% <11.11%> (-0.06%)	⬇️
unitexamples-tests	73.87% <94.44%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
panel/tests/test_util.py	95.16% <90.00%> (-4.84%)	⬇️
panel/util/__init__.py	87.59% <95.23%> (+0.65%)	⬆️
panel/reactive.py	80.60% <100.00%> (ø)
panel/tests/test_reactive.py	99.19% <100.00%> (+0.03%)	⬆️

... and 1 file with indirect coverage changes

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