Add sqlite-lint to 'pkg/schema/lint'

pkg/schema/lint/test_schemas/failure-has-foreign-key-no-index.sql

@@ -0,0 +1,12 @@
+create table stuff (
+    rowid integer primary key,
+    data text not null,
+    amount integer not null
+) strict;
+
+create table stuff2 (
+    weird_pk integer primary key,
+    label text not null unique,
+    stuff_id integer references stuff(rowid),
+    alternative_stuff_id integer references stuff(amount)
+) strict;