* Add support for Intel Gaudi hpu accelerators

* Fixing the `find_spec` dep.

* Fixing unused import.

---------

Co-authored-by: Nicolas Patry <patry.nicolas@protonmail.com>

* Restore compatibility with Rust 1.74

PR #544 added support for `no_std` feature. The PR changed
`std::error::Error` to `core::error::Error`. The `core::error` trait was
stabilized in Rust 1.81, so the change bumped MSRV to 1.81. Before the
Python package built with Rust 1.66 and the `safetensors` create with
all features built with 1.74.

This commit restores compatibility with Rust 1.74 for `std` builds:

- `mixed_integer_ops` feature requires 1.66
- `half v2.4.1` requires 1.70
- `clap_lex v0.7.4` requires 1.74

I'm also adding `rust-version` to `Cargo.toml`, so cargo creates a
backwards compatible `Cargo.lock`. By default, Cargo >= 1.83 creates a
`v4` lock file, which is not compatible with Cargo < 1.78.

Signed-off-by: Christian Heimes <christian@python.org>

* Merging the test matrix.

---------

Signed-off-by: Christian Heimes <christian@python.org>
Co-authored-by: Nicolas Patry <patry.nicolas@protonmail.com>

* Return error on out of range index

Fix issue #560, return a SliceOutOfRange error if the stop value
exceeds the available span.

* Improve the fix.

* Revert this change.

* Adding unit test around invalid range

* Checking for too many slices too.

* Small cleanup.

---------

Co-authored-by: Nicolas Patry <patry.nicolas@protonmail.com>

* Demoing zero-copy save.

* Fixing clippy issue.

* Some cleanup.

* Sdist doesn't require feature ?

* Incorrect clean.

* Clippy ?

* Sanity check

* Fixing the doc builder?

* Using pre-commit for quality.

* This should work.

* Clippy variant.

* pyfeature typo.

* Bypassing the necessity for an env ?

* Remove maturin.

* BigEndian fix.

* Only black.

* We need to check both features.

* ??

* Asking for readonly is not possible.

* Before the build.

* Fixing byte-endian?

This reverts commit 4b3864c.