fix(node:zlib): expose stream close method values

[andrewtdiz]

Summary

• expose function-valued close and destroy property reads on zlib stream handles
• add a granular parity fixture for zlib.createGzip() method property shape

Part of #793.

Evidence

• Baseline exact node-suite/zlib/streams/close-destroy-method-values: FAIL, report test-parity/reports/parity_report_20260528_095304.json
• Final exact node-suite/zlib/streams/close-destroy-method-values: PASS, report test-parity/reports/parity_report_20260528_095459.json
• Full granular node-suite/zlib: PASS 47/47, report test-parity/reports/parity_report_20260528_095516.json
• cargo check -p perry-runtime -p perry-stdlib -p perry-codegen: PASS with existing warnings
• cargo fmt --check: PASS
• jq empty test-parity/known_failures.json: PASS
• git diff --check: PASS

DeepWiki

• reference/deepwiki/nodejs-node-zlib-stream-method-values-2026-05-28.md

Non-goals

• no lifecycle callback or close-callback semantics
• no full Transform inheritance rewrite
• no .params() / .reset() / .bytesWritten work
• no zstd implementation