lpython: init at 0.19.0

[dit7ya]

Description of changes

https://github.com/lcompilers/lpython

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.

[tobim]

Builds fine but doesn't work.

results/lpython/bin/lpython test.py 
semantic error: Could not find the module 'lpython'. If an import path is available, please use the `-I` option to specify it
 --> test.py:1:1
  |
1 | from lpython import i32
  | ^^^^^^^^^^^^^^^^^^^^^^^

This issue is tracked in lcompilers/lpython#2312.

Using the module also doesn't work:

PYTHONPATH="$(lpython --get-rtl-dir)/lpython" python -c "import lpython"

lcompilers/lpython#2265