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Declare free-threading support in the sparse extension (#3101)

`dpnp.backend.extensions.sparse._sparse_impl` was the only dpnp
extension module declared without `py::mod_gil_not_used()`. On a
free-threaded Python build, importing it (through `dpnp.scipy.sparse`)
re-enabled the GIL for the whole process, with a `RuntimeWarning`. Every
other pybind11 extension and every Cython module in dpnp already
declares free-threading support.

The extension keeps no shared mutable state beyond its dispatch tables,
which are filled once at import, so it can be declared safe like the
others.

A new `dpnp/tests/test_free_threading.py` runs on free-threaded builds
only (the `3.14t` CI jobs). In a subprocess it imports every compiled
dpnp module and checks that the GIL stays disabled, so a future
extension that forgets the declaration is caught too. It skips if a
dependency has already re-enabled the GIL.

The C++ change was not built locally; the new test was checked locally
only for its module discovery (it finds and imports all 25 compiled
modules) and its skip paths, so the CI `3.14t` jobs are the real check.

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