fix: avoid nodejs stream namespace leak

[kvz]

Why

The all-packages consumer smoke showed that runtime installs work, but @transloadit/sev-logger still leaked NodeJS.WriteStream through its public declarations. That makes TypeScript consumers depend on a global NodeJS namespace even when they only need the logger's stream contract.

What changed

• Added a structural SevLoggerStream interface for the logger's stdout/stderr options and properties.
• Exported SevLoggerStream from the package root.
• Versioned @transloadit/sev-logger to 1.0.2 with a changelog entry.

Verification

• corepack yarn install --immutable
• corepack yarn dedupe --check
• corepack yarn check
• corepack yarn npm audit --recursive --all
• git diff --check
• Local tarball TypeScript consumer smoke without @types/node