Lisp compiler source

This source is provided in stages that roughly correspond to the blog posts in the Lisp compiler series.

If you are running the Python version,

$ uv run unittest-parallel -j 8 -p compiler.py --level=test
Running 27 test suites (27 total tests) across 8 processes
...........................
----------------------------------------------------------------------
Ran 27 tests in 0.777s

OK
$

Python 3.12 is required for tests only (NamedTemporaryFile.delete_on_close).