Auxiliary column support (#123)

* initial pass at PARTITION KEY support.

* Initial pass, allow auxiliary columns on vec0 virtual tables

* update TODO

* unit tests

* gha this PR branch

* fixup tests

* doc internal

* fix tests, KNN/rowids in

* define SQLITE_INDEX_CONSTRAINT_OFFSET

* whoops

* update tests, syrupy, use uv

* un ignore pyproject.toml

* dot

* tests/

* type error?

* win: .exe, update error name

* try fix macos python, paren around expr?

* win bash?

* dbg :(

* explicit error

* op

* dbg win

* win ./tests/.venv/Scripts/python.exe

* block UPDATEs on partition key values for now

* test this branch

* accidentally removved "partition key type mistmatch" block during merge

* typo ugh

* bruv

* start aux snapshots

* drop aux shadow table on destroy

* enforce column types

* block WHERE constraints on auxiliary columns in KNN queries

* support delete

* support UPDATE on auxiliary columns

test.sql

@@ -1,9 +1,30 @@
+
 .load dist/vec0
 .echo on
 .bail on
 
 .mode qbox
 
+create virtual table vec_chunks using vec0(
+  chunk_id integer primary key,
+  contents_embedding float[1],
+  +contents text
+);
+insert into vec_chunks(chunk_id, contents_embedding, contents) values
+  (1, '[1]', 'alex'),
+  (2, '[2]', 'brian'),
+  (3, '[3]', 'craig'),
+  (4, '[4]', 'dylan');
+
+select * from vec_chunks;
+
+select chunk_id, contents, distance
+from vec_chunks
+where contents_embedding match '[5]'
+and k = 3;
+
+.exit
+
 create virtual table v using vec0(a float[1]);
 select count(*) from v_chunks;
 insert into v(a) values ('[1.11]');