Document Python configuration for embedded hosts

[nightcityblade]

Fixes #1097

Summary

• document that debugpy.configure(python=...) selects the interpreter used to launch the adapter process
• add an embedded-host example that configures the interpreter before debugpy.listen()

Tests

• python3 -m flake8 src/debugpy/public_api.py
• python3 -m ruff check src/debugpy/public_api.py
• pytest -n0 tests/debugpy/test_api.py tests/debugpy/test_docstrings.py (3 passed)

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