Added a search query option for the addwidget dialog

[DanPeled]

Wasnt sure how to write the test for this, if you (the reviewer) will be able to explain me / do it ill be glad

[codecov]

Codecov Report

Attention: Patch coverage is 98.48485% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.58%. Comparing base (bcb85f7) to head (986d539).
Report is 1 commits behind head on main.

Files	Patch %	Lines
lib/widgets/network_tree/networktables_tree.dart	98.27%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
+ Coverage   63.41%   63.58%   +0.16%     
==========================================
  Files          75       75              
  Lines        7867     7892      +25     
==========================================
+ Hits         4989     5018      +29     
+ Misses       2878     2874       -4     

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[Gold872]

For adding unit tests, what would be the most practical to test the new features is to set up a mock NT connection with several sub-topics, and entering different search queries into the text box, and making sure that only certain tables are visible after searching