fix: improve python api & packaging

[xushiyan]

Description

Improve python API & packaging.

How are the changes test-covered

• [ ] N/A
• [x] Automated tests (unit and/or integration tests)
• [ ] Manual tests
  • [ ] Details are described below

[codecov[bot]]

Codecov Report

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

Project coverage is 90.80%. Comparing base (d90abed) to head (c76553b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #176 +/- ## ========================================== - Coverage 90.81% 90.80% -0.01% ========================================== Files 20 20 Lines 958 957 -1 ========================================== - Hits 870 869 -1 Misses 88 88 ```

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