[cpp] add explicit hdf5 v1.12.0 dependency

[immanuelazn]

This pull request updates the package to require HDF5 version 1.12.0 or greater and adds new system requirements for building the package. The changes ensure that the package checks for the correct HDF5 version during configuration and at compile time, and they update documentation to reflect these requirements.

Addresses #323

System requirements and documentation:

• Updated DESCRIPTION to require C++17, HDF5 (>= 1.12), and optionally Highway (>= 1.0.5), with detection and fallback instructions.

Build and configuration checks:

• Updated error messages in configure and configure.win scripts to specify that HDF5 version 1.12.0 or greater is required. [1] [2]
• Added a compile-time check in h5write.c to enforce that HDF5 version 1.12.0 or greater is present, producing a clear error if not.

Testing:

• Validated that the checks with hdf5 1.10.5 do not pass, but do pass with hdf5 1.12.0.