Bump version to 0.2.7 and add NIF version 2.16 support

- Bump version from 0.2.6 to 0.2.7 in mix.exs
- Add nif_version_2_16 feature to Cargo.toml for Erlang/OTP 26+ support

Expand Linux target support and improve CI caching

- Add support for musl targets (aarch64-unknown-linux-musl, x86_64-unknown-linux-musl)
- Add NIF 2.16 support alongside existing 2.15
- Implement Rust dependency caching with Swatinem/rust-cache@v2
- Add Mix dependency caching to speed up builds
- Improve build matrix organization for better readability

This addresses the user request for expanded Linux compatibility and
incorporates caching strategies from the ex_rocket project reference.

Bump version to 0.2.5

- Update version in mix.exs to 0.2.5
- Update CHANGELOG.md with release notes for 0.2.5
- Fix checksum file for precompiled NIFs compatibility

This release fixes compilation errors related to missing precompiled NIF checksums.
The checksum file will be updated after CI builds the precompiled NIFs for this version.

Bump version to 0.2.4

Bump version to 0.2.3

Release v0.2.2