Feat/83 official api support

[datnguye]

resolves #83

Description

Exposing 2 APIs officially:

• get_erd
• get_model_erd

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 ✅

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

❗ 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

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

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