Add box selection tool

[Donut-Muffin]

Previously there was only one lasso selection tool which users would have to drag around object to make selections.

This pull request adds a box selection tool that allows users to make rectangular selections around objects, rather than drawing around them.

Test cases have been implemented (based on the original lasso selection tests). The lasso selection tool has been refactored for clarity.

Sorry if the project structure needs improvement. This is my first time using Flutter and Dart.

Addresses issue #1675

box_select_demo.mp4

[codecov]

Codecov Report

❌ Patch coverage is 79.45946% with 38 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.00%. Comparing base (3a51ed7) to head (8513069).

Files with missing lines	Patch %	Lines
lib/pages/editor/editor.dart	25.92%	20 Missing ⚠️
lib/components/canvas/select_result.dart	11.11%	8 Missing ⚠️
lib/components/toolbar/toolbar.dart	63.15%	7 Missing ⚠️
lib/data/tools/select.dart	0.00%	1 Missing ⚠️
lib/data/tools/select_box.dart	98.57%	1 Missing ⚠️
lib/data/tools/select_lasso.dart	98.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1718      +/-   ##
==========================================
+ Coverage   51.64%   52.00%   +0.35%     
==========================================
  Files         131      134       +3     
  Lines        9376     9469      +93     
==========================================
+ Hits         4842     4924      +82     
- Misses       4534     4545      +11     

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[Donut-Muffin]

It appears like a lot of code has been added/removed but a significant portion is refactors since I renamed the Select tool to SelectLasso