refactor(bindings/python): only enable pyo3/entension-module feature when building with maturin
#1680
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See https://pyo3.rs/v0.18.1/faq#i-cant-run-cargo-test-or-i-cant-build-in-a-cargo-workspace-im-having-linker-issues-like-symbol-not-found-or-undefined-reference-to-_pyexc_systemerror
maturinhas changed the default project layout generated frommaturin newto exactly this to avoid such issue.Fixes #1675