Blosc2

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* Do not pass `-m` flags when compiling `shuffle.c`. This prevents the
compiler from incidentally optimizing the code called independently
of the runtime CPU check to these instruction sets, effectively
causing `SIGILL` on other CPUs. Fixes 621. Thanks to t20100 and mgorny.

* Internal LZ4 sources bumped to 1.10.0.

* Allow direct loading of plugins by name, without relying on
the presence of python. Thanks to boxerab.

* Add `b2nd_nans` method (PR 624). Thanks to waynegm.

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* Removed some duplicated functions. See https://github.com/Blosc/c-blosc2/issues/503.

* Added a new io mode to memory map files. This forced to change the `io_cb` read API.
See https://github.com/Blosc/c-blosc2/blob/main/tests/test_mmap.c to see an example on
how to use it.

* Updated the `SOVERSION` to 4 due to the API change in `io_cb` read.

* Added functions to get cparams, dparams, storage and io defaults respectively.

* Internal zstd sources updated to 1.5.6.

* Fixed a bug when setting a slice using prefilters.

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* Bumped SONAME due to recent API changes. See https://github.com/Blosc/c-blosc2/issues/581.

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* More fixes for internal fuzzer.

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* Fixes for CVE-2024-3203 and CVE-2024-3204.

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* When loading plugins, first try with `python` and then `python3`.
This is because many linux distros do not have `python` as a
symlink to `python3` anymore.