lix: init at 2.90-beta.1

[Lix](https://lix.systems) is a fork of CppNix, the original Nix implementation. It behaves like `nixVersions.*` in terms of packaging with a big difference: it uses Meson for its build system.

Therefore, it is not possible to share the packaging trees.

The rest is pretty mundane:

- Lix will passthru all the time to the `nixosTests.misc` to smoke test any critical regressions as a last line after all our regression battery on the Lix project side.
- Cross compilation has been extensively tested.
- Static compilation is known to fail on a test.

Internal API documentation is out of scope for this commit.

Signed-off-by: Raito Bezarius <masterancpp@gmail.com>

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