Substack loader improvements

[sidmohanty11]

Ref: #949 (comment)

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (4a5ed1d) 64.33% compared to head (66a51ae) 64.19%.
Report is 1 commits behind head on main.

❗ Current head 66a51ae differs from pull request most recent head bfca364. Consider uploading reports for the commit bfca364 to get more accurate results

Files	Patch %	Lines
embedchain/loaders/substack.py	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #952      +/-   ##
==========================================
- Coverage   64.33%   64.19%   -0.15%     
==========================================
  Files         118      118              
  Lines        4405     4415      +10     
==========================================
  Hits         2834     2834              
- Misses       1571     1581      +10     

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