lib: add cmakeOption and cmakeBool

[AndersonTorres]

Description of changes

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• 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/)
• 23.11 Release Notes (or backporting 23.05 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.

[AndersonTorres]

These vars can hold data types:

https://cmake.org/cmake/help/latest/command/set.html

It looks too gui-driven, and also too dependent on the upstream - what if this variables are truly strings that happen to act like booleans?

For now I will treat the default as STRING.

[lilyinstarlight]

The G'MIC derivation changes themselves look fine to me (aside from the second commit title erroneously using gmic: instead of gmic-qt: which is a minor typo), but I'll make no comment on the overall change right now

Ofborg requested my review for gmic so I figured I'd give it