Implement search correctness validation in test_clp_json_search

[coderabbitai]

Context

As part of the modular integration test design introduced in PR #1843, placeholder test functions were added for clp-json package tests. The test_clp_json_search test currently validates package startup but needs implementation to compress a dataset, search through it, and verify search correctness.

Requirements

• Compress a sample dataset using the clp-json package
• Perform search operations on the compressed dataset
• Validate that search results are correct

References

• PR: feat(integration-tests): Modularize package tests with per-mode directories and module-scoped fixtures. #1843
• Discussion: feat(integration-tests): Modularize package tests with per-mode directories and module-scoped fixtures. #1843 (comment)
• File: integration-tests/tests/package_tests/clp_json/test_clp_json.py
• Requested by: @junhaoliao