test: add btree_index unit tests (26 tests)

[poyrazK]

Summary

• Add btree_index_tests.cpp with 26 unit tests for BTreeIndex B+ tree index storage
• Add add_cloudsql_test(btree_index_tests tests/btree_index_tests.cpp) to CMakeLists.txt

Test Coverage

• Constructor tests (basic, text key)
• Create/Open/Drop lifecycle
• Insert single/multiple/duplicate entries
• Search existing/non-existent keys
• Remove entry
• Scan iterator tests
• TupleId and Entry tests
• Index name and key type
• Data persistence across open/close

Test plan

• Build passes
• All 26 tests pass

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 624d6dea-c0d0-44f1-9d65-bc07cde675f4

📥 Commits

Reviewing files that changed from the base of the PR and between 7a91cee and 0acd816.

📒 Files selected for processing (2)

• CMakeLists.txt
• tests/btree_index_tests.cpp

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/btree-index-tests

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