lomiri.lomiri*: Init online accounts manager & settings plugin

[OPNA2608]

Description of changes

Working towards #99090.

This inits:

• Lomiri Online Accounts, the API for Lomiri's simplified online accounts management
• Lomiri Online Accounts Plugins, plugins to create & manage accounts for various online services
• Lomiri System Settings Online Accounts, a settings app plugin to allow managing one's online accounts

This also fixes an issue with the localisation in LSS, which I didn't spot in the latest OTA update.

The settings app page shows up, but without any services being listed by default. This behaviour is identical to what happens on Debian if I build the involved packages there, so not sure what's wrong. Don't have a device to test it on UBtouch. Seems to be expected behaviour, see #340391 (comment) for reason.

I don't think this is urgently needed, so I'll leave this as-is and see if there's any updates upstream on this.

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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[OPNA2608]

@ofborg build nixosTests.lomiri

[OPNA2608]

After some more prodding, I think this just needs packages that actually provide accountsservice applications & services for the settings entry to provide account creation options. lomiri-sync-monitor seems to be providing some, which show up when running the settings app in the PDK.

So I think this is fine as-is for now? And I'll give this another look when I get to the sync monitor (which has its own list of dependencies that need to be init'd first, sigh).

[OPNA2608]

Inching closer to a working state, but still not really done.