fix(pg-delta): normalize function body line endings

[pjpjq]

Summary

• Normalize CRLF/LF differences in source_code, sql_body, and definition when building the procedure stable snapshot.
• Reuse the same line-ending normalization for body-only non-alterable comparisons to avoid false CREATE OR REPLACE FUNCTION diffs.
• Add regression coverage showing line-ending-only differences do not produce a diff while owner-only changes are still detected.

Fixes #242.
Replaces #276.

Tests

• bun test packages/pg-delta/src/core/objects/procedure/procedure.diff.test.ts
• cd packages/pg-delta && bun run check-types
• cd packages/pg-delta && bun run format-and-lint
• git diff --check origin/main...HEAD

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[avallete]

I think the issue with such approach is that the function itself might contain an actual "\r\n" in it, then I wonder how the normalization would go 🤔