refactor: fix memory_helper.c naming to follow HACKING.md conventions

[suketa]

Summary

• Rename all static functions in memory_helper.c from rbduckdb_memory_helper_* to memory_helper_s_* to follow HACKING.md rule 8: singleton methods must use the classname_s_methodname pattern
• The rbduckdb_ prefix is reserved for extern functions (rule 11); using it on static functions was a naming convention violation

Test plan

• Compiled successfully
• All 1102 tests pass, 0 failures, 0 errors

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3e267b84-04cd-4a72-b031-af9799f5dce5

📥 Commits

Reviewing files that changed from the base of the PR and between bcf2bf2 and 1500a45.

📒 Files selected for processing (1)

• ext/duckdb/memory_helper.c

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch refactor/memory-helper-naming

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