table_row & tests modules to separate files (#51059)
Extract data table modules into separate files This PR extracts the `tests` and `table_row` modules from `data_table.rs` into separate files to improve code organization. This is preparatory work for the upcoming column width API rework (#2 in the series), where separating mechanical changes from logical changes will make the review easier. The extraction was performed using rust-analyzer's "Extract module to file" command. **Context:** This is part 1 of a 3-PR series improving data table column width handling: 1. **This PR**: Extract modules into separate files (mechanical change) 2. [#51060](https://github.com/zed-industries/zed/pull/51060) - Introduce width config enum for redistributable column widths (API rework) 3. Implement independently resizable column widths (new feature) The series builds on previously merged infrastructure: - [#46341](https://github.com/zed-industries/zed/pull/46341) - Data table dynamic column support - [#46190](https://github.com/zed-industries/zed/pull/46190) - Variable row height mode for data tables Primary beneficiary: CSV preview feature ([#48207](https://github.com/zed-industries/zed/pull/48207)) Release Notes: - N/A
Zed
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