Update CHANGELOG.md for v1.6.0

[mason-sharp]

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[coderabbitai]

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The update includes notes on batch concat_ws optimizations, JSON memory efficiency improvements, an out-of-memory fix for recursive diffs, and improved connection closing in table diff operations.\n\n## Changes\n\n|Cohort / File(s)|Summary|\n|---|---|\n|**CHANGELOG Update** <br> `docs/CHANGELOG.md`|Version bump to v1.6.0 with release notes covering performance optimizations (batch concat_ws, JSON memory usage), and bug fixes (recursive diff OOM, connection management).|\n\n## Poem\n\n> 🐰 From beta dreams to golden release,\n> Version 1.6 brings sweet peace!\n> Memory optimized, connections tight,\n> Recursive diffs now run just right.\n> A changelog written, the journey complete! 📝✨\n\n</details>\n\n<!-- walkthrough_end -->\n\n\n<!-- finishing_touch_checkbox_start -->\n\n<details>\n<summary>✨ Finishing Touches</summary>\n\n<details>\n<summary>🧪 Generate unit tests (beta)</summary>\n\n- [ ] <!-- {\"checkboxId\": \"f47ac10b-58cc-4372-a567-0e02b2c3d479\", \"radioGroupId\": \"utg-output-choice-group-unknown_comment_id\"} -->   Create PR with unit tests\n- [ ] <!-- {\"checkboxId\": \"07f1e7d6-8a8e-4e23-9900-8731c2c87f58\", \"radioGroupId\": \"utg-output-choice-group-unknown_comment_id\"} -->   Post copyable unit tests in a comment\n- [ ] <!-- {\"checkboxId\": \"6ba7b810-9dad-11d1-80b4-00c04fd430c8\", \"radioGroupId\": \"utg-output-choice-group-unknown_comment_id\"} -->   Commit unit tests in branch `task/prep-v1.6.0`\n\n</details>\n\n</details>\n\n<!-- finishing_touch_checkbox_end -->\n\n<!-- announcements_start -->\n\n> [!TIP]\n> Try [Coding Plans](https://www.coderabbit.ai/issue-planner). 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