mfem: init at 4.7

[qbisi]

Motivation

MFEM is a free, lightweight, scalable C++ library for finite element methods.

This commit init mfem built with optional dependencies mpi, suitesparse, mumps_par.

These three dependencies are commonly used in mfem examples so they will be set with by default.

Need more careful consideration before merge.

• keep int/float size align with its dependency
• distinguish buildInputs and propagatedBuildInputs
• make sure there is no redundent or missing dependencies for each combination of options
• people who are interested in building mfem prefer to build mumps_par with parmetis which is unfree and thus by default disabled, how can we override mfem built with thoes unfree dependencies easily.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[nim65s]

diff lgtm, builds fine or x86_64-linux, test pass

NB: this include #355128