Fix echoing empty binary messages

[puneetdixit200]

Fixes #3487

Summary

• preserve binary message types when adding a trailing newline in click.echo
• cover empty bytes and bytearray output to default and binary streams

Tests

• uv run --frozen python -m pytest tests/test_utils.py -k "echo" -q
• uv run --frozen python -m pytest tests/test_utils.py -q
• uv run --frozen python -m pytest -q
• uv run --frozen ruff check src\click\utils.py tests\test_utils.py