testers.testEqualArrayOrMap: init

[ConnorBaker]

As part of the work I've done on rewriting the way CUDA software is packaged with Nix (https://github.com/ConnorBaker/cuda-packages) I made several testers, utility scripts, and setup hooks which I'm in the process of upstreaming.

This PR comes from https://github.com/ConnorBaker/cuda-packages/tree/18f4f5465272f6a88ed9bc660b3bc31dc01d4719/pkgs/by-name/mk/mkCheckExpectedArrayAndMap.

At its core, this PR introduces two utility functions declared in shell scripts, assertEqualArray and assertEqualMap. While they may be included and used directly, they are meant to be used through testers.testEqualArrayOrMap, as it provides an easy interface against which one can assert scripts populate bash arrays (including associative arrays, referred to as "maps" to disambiguate) with expected values.

This tester has a number of uses and paves the way for more complicated array utilities, like those found here: https://github.com/ConnorBaker/cuda-packages/tree/18f4f5465272f6a88ed9bc660b3bc31dc01d4719/pkgs/by-name/ar/arrayUtilitiesHook.

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/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 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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