refactor: new codebase structure

[datnguye]

Description

Revamp codebase structure

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (eb0bf25) to head (6a3b6d1).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #139      +/-   ##
===========================================
+ Coverage   99.93%   100.00%   +0.06%     
===========================================
  Files          32        40       +8     
  Lines        1509      1732     +223     
===========================================
+ Hits         1508      1732     +224     
+ Misses          1         0       -1     

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