Cleaning model state

[satwik-kambham]

📝 Description

Type: 🚀 restructure

Removing old model state and renaming new model state.

[codecov]

Codecov Report

Merging #2124 (e45dcad) into master (dd838cb) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head e45dcad differs from pull request most recent head b9142ef. Consider uploading reports for the commit b9142ef to get more accurate results

@@            Coverage Diff             @@
##           master    #2124      +/-   ##
==========================================
+ Coverage   61.63%   61.64%   +0.01%     
==========================================
  Files          75       75              
  Lines        8687     8669      -18     
==========================================
- Hits         5354     5344      -10     
+ Misses       3333     3325       -8     

Impacted Files	Coverage Δ
tardis/model/base.py	90.33% <100.00%> (+1.56%)	⬆️

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