Add modal bar button to download plot data as CSV

[ruchika2ar]

Issue number of the reported bug or feature request: #712

Describe your changes Add a button to the RSS/Heap usage over time graph to download the data as CSV.

Testing performed Tested the changes locally by downloading the file.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.90%. Comparing base (1dcf950) to head (d9a690a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #769      +/-   ##
==========================================
- Coverage   92.92%   92.90%   -0.02%     
==========================================
  Files          95       95              
  Lines       11690    11686       -4     
  Branches      407      407              
==========================================
- Hits        10863    10857       -6     
- Misses        827      829       +2     

Flag	Coverage Δ
cpp	92.90% <ø> (-0.02%)	:arrow_down:
python_and_cython	92.90% <ø> (-0.02%)	:arrow_down:

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[godlygeek]

Finally merged, thanks again @ruchika2ar !