Fix/set filter method

[margalva]

Fix a bug in template API: get_filter and set_filter was used both for high-level template method and for the filter value in the generator for table filter by value. Rename the methods, and leave set_filter as deprecated method for backward compatibility.

As we're at it, start migrating the lower level API documentation over pydynamicreporting docs.

[codecov-commenter]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (231525f) 75.75% compared to head (95238ec) 75.64%.

Files	Patch %	Lines
...nsys/dynamicreporting/core/utils/report_objects.py	52.38%	9 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #80      +/-   ##
==========================================
- Coverage   75.75%   75.64%   -0.11%     
==========================================
  Files          16       16              
  Lines        4953     4972      +19     
  Branches     1048     1050       +2     
==========================================
+ Hits         3752     3761       +9     
- Misses        851      860       +9     
- Partials      350      351       +1     

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