remove get_value() from DataModel

[dmpetrov]

That's a forgotten part of File redesign #102

[cloudflare-workers-and-pages]

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Latest commit:	1ebc6d9
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.55%. Comparing base (baec8e0) to head (1ebc6d9).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #119   +/-   ##
=======================================
  Coverage   85.55%   85.55%           
=======================================
  Files          93       93           
  Lines        9468     9466    -2     
  Branches     1889     1889           
=======================================
- Hits         8100     8099    -1     
+ Misses       1039     1038    -1     
  Partials      329      329           

Flag	Coverage Δ
datachain	85.49% <ø> (+<0.01%)	⬆️

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