feat(sqlite): virtual tables and fts5 supported

Fixes: #1797

Out of scope:
* table-valued function. https://www.sqlite.org/vtab.html#tabfunc2
* insert commands. https://www.sqlite.org/fts5.html#special_insert_commands
* you cannot use table name to the left of MATCH or equality operator

Author: mcdoker18

internal/endtoend/testdata/virtual_table/sqlite/go/db.go

@@ -0,0 +1,35 @@
+-- name: SelectAllColsFt :many
+SELECT b FROM ft
+WHERE b MATCH ?;
+
+-- name: SelectAllColsTblFt :many
+SELECT b, c FROM tbl_ft
+WHERE b MATCH ?;
+
+-- name: SelectOneColFt :many
+SELECT b FROM ft
+WHERE b = ?;
+
+-- name: SelectOneColTblFt :many
+SELECT c FROM tbl_ft
+WHERE b = ?;
+
+-- name: SelectHightlighFunc :many
+SELECT highlight(tbl_ft, 0, '<b>', '</b>') FROM tbl_ft
+WHERE b MATCH ?;
+
+-- name: SelectSnippetFunc :many
+SELECT snippet(tbl_ft, 0, '<b>', '</b>', 'aa', ?) FROM tbl_ft;
+
+-- name: SelectBm25Func :many
+SELECT *, bm25(tbl_ft, 2.0) FROM tbl_ft
+WHERE b MATCH ? ORDER BY bm25(tbl_ft);
+
+-- name: UpdateTblFt :exec
+UPDATE tbl_ft SET c = ? WHERE b = ?;
+
+-- name: DeleteTblFt :exec
+DELETE FROM tbl_ft WHERE b = ?;
+
+-- name: InsertTblFt :exec
+INSERT INTO tbl_ft(b, c) VALUES(?, ?);

internal/endtoend/testdata/virtual_table/sqlite/go/models.go

@@ -0,0 +1,15 @@
+CREATE TABLE tbl(a INTEGER PRIMARY KEY, b TEXT, c TEXT, d TEXT, e INTEGER);
+
+CREATE VIRTUAL TABLE tbl_ft USING fts5(b, c UNINDEXED, content='tbl', content_rowid='a');
+
+CREATE VIRTUAL TABLE ft USING fts5(b);
+
+CREATE TRIGGER tbl_ai AFTER INSERT ON tbl BEGIN
+  INSERT INTO tbl_ft(rowid, b, c) VALUES (new.a, new.b, new.c);
+END;
+
+INSERT INTO tbl VALUES(1, 'xx yy cc', 't', 'a', 11);
+INSERT INTO tbl VALUES(2, 'aa bb', 't', 'a', 22);
+
+INSERT INTO ft VALUES('xx cc');
+INSERT INTO ft VALUES('cc bb');

internal/endtoend/testdata/virtual_table/sqlite/go/query.sql.go

@@ -0,0 +1,9 @@
+version: '2'
+sql:
+- schema: schema.sql
+  queries: query.sql
+  engine: sqlite
+  gen:
+    go:
+      package: querytest
+      out: go