Feat/83 official api support

[datnguye]

resolves #83

Description

Exposing 2 APIs officially:

• get_erd
• get_model_erd

Checklist

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

[codecov[bot]]

Codecov Report

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

Comparison is base (6b3bba5) 100.00% compared to head (473488c) 100.00%.

:exclamation: Current head 473488c differs from pull request most recent head 6dc60fd. Consider uploading reports for the commit 6dc60fd to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #91 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 32 32 Lines 965 1005 +40 ========================================= + Hits 965 1005 +40 ```

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