Add ColumnSchemaTest

[Tigrov]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	-

[what-the-diff]

PR Summary

• Introduction of ColumnSchemaTest
  A new file, ColumnSchemaTest.php, has been added. This contains a comprehensive test suited specifically for the ColumnSchema class. This is expected to improve our test coverage and ensure the robustness of the mentioned class.

• Column Name Modification in two files
  The time column name has been updated to timestamp_col, and this modification has been made in both the schemaProvider.php and oci.sql files. This new naming convention should increase clarity and reduce potential confusion, as it's more descriptive of its function.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (fdd6eb0) 98.29% compared to head (5097bd5) 98.29%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #228   +/-   ##
=========================================
  Coverage     98.29%   98.29%           
  Complexity      183      183           
=========================================
  Files            16       16           
  Lines           586      586           
=========================================
  Hits            576      576           
  Misses           10       10           

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[samdark]

👍