Remove unnecessary Stringable interface.

[terabytesoftw]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌

[codecov]

Codecov Report

Base: 98.02% // Head: 98.02% // No change to project coverage 👍

Coverage data is based on head (073c0d9) compared to base (827c475).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 073c0d9 differs from pull request most recent head 572eb49. Consider uploading reports for the commit 572eb49 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #157   +/-   ##
=========================================
  Coverage     98.02%   98.02%           
  Complexity      196      196           
=========================================
  Files            16       16           
  Lines           607      607           
=========================================
  Hits            595      595           
  Misses           12       12           

Impacted Files	Coverage Δ
src/ColumnSchemaBuilder.php	100.00% <100.00%> (ø)

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