Add bounds check database collector via -bcdb flag

[Copilot]

• Understand existing bounds_check_info module and codebase structure
• Revert the unnecessary crate_info module and all its wiring (no new feature needed)
• Add crate_name: String to BoundsCheckDb in bounds_check_info/mod.rs
• Populate crate_name from tcx.crate_name(LOCAL_CRATE) in BoundsCheckAnalyzer::new()
• Update test_bounds_check_db test assertion to verify crate_name appears in the JSON output
• Build and verify the JSON output includes crate_name
• Run all tests

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