Turbopack server HMR: inline source maps for `eval`ed modules (#90561)
Previously, we lost stack frame information when server hmr code was applied through `eval`.
This adds and calls \`maybeInlineSourcemap()\` to the Turbopack Node.js HMR runtime that appends \`//# sourceURL\` and \`//# sourceMappingURL\` (base64-encoded) to each `eval`ed module entry.
Test Plan: CI for #90389