Support streaming to pipe

**Describe the bug**
When using in terminal text streaming works as it should, but when piping output - it shows up all at once.

**To Reproduce**
```
pytgpt generate --quiet --disable-conversation "Write a short story"|less
```

**Expected behavior**
When I pipe other utilities to `less` - I see output appear line by line.

**Environment:**
- os version: Windows 10



