Switch Core tests to "Test Item Framework"

[ytdHuang]

Checklist

Thank you for contributing to QuantumToolbox.jl! Please make sure you have finished the following tasks before opening the PR.

• Please read Contributing to Quantum Toolbox in Julia.
• Any code changes were done in a way that does not break public API.
• Appropriate tests were added and tested locally by running: make test.
• Any code changes should be julia formatted by running: make format.
• All documents (in docs/ folder) related to code changes were updated and able to build locally by running: make docs.
• (If necessary) the CHANGELOG.md should be updated (regarding to the code changes) and built by running: make changelog.

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Description

As title, this PR switch our current Core tests structure into the Test Item Framework

For all the other (code quality and extension) tests, we still use the traditional Test.jl for faster precompilation in GitHub CI pipeline.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.46%. Comparing base (a1d1627) to head (b12a5c8).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #475      +/-   ##
==========================================
- Coverage   94.08%   93.46%   -0.63%     
==========================================
  Files          49       49              
  Lines        3042     3074      +32     
==========================================
+ Hits         2862     2873      +11     
- Misses        180      201      +21     

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