Support jslinking Parameterized class

[philippjfr]

The ReactiveHTML implementation also included the ability to generate a DataModel for a Parameterized object. Since we already implemented this, we should also provide for the ability to set up bi-directional linking between Parameterized objects and other components. By adding a helper function called create_linked_datamodel which creates a Bokeh DataModel and links it to the provided Parameterized object we can easily support this usecase.

[codecov]

Codecov Report

Merging #2441 (5f4a16f) into master (abc56e7) will decrease coverage by 0.07%.
The diff coverage is 57.14%.

@@            Coverage Diff             @@
##           master    #2441      +/-   ##
==========================================
- Coverage   83.47%   83.40%   -0.08%     
==========================================
  Files         182      182              
  Lines       22668    22707      +39     
==========================================
+ Hits        18923    18939      +16     
- Misses       3745     3768      +23     

Impacted Files	Coverage Δ
panel/links.py	80.15% <55.88%> (-4.39%)	⬇️
panel/models/reactive_html.py	79.20% <100.00%> (-1.20%)	⬇️
panel/reactive.py	75.46% <100.00%> (+0.03%)	⬆️

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