We now have a literal representation for BLOBs. Any string literal starting
with '\x' is parsed as an hex encoded blob. This mimics PostgreSQL's behavior.
```sql
SELECT '\xAAFF';
```
This adds support for sequences to Genji. For now, only sequence creation and use is supported, dropping or modifying a sequence will be added later.
To create a sequence:
```sql
CREATE SEQUENCE seq INCREMENT BY 10 MINVALUE 100 NO MAXVALUE START 500 CACHE 32 CYCLE;
```
By default, if there is a conflict when inserting a document,
we abort the current statement. Are considered conflicts
any error returned by duplicate primary keys or unique
constraint violations. The ON CONFLICT clause only
supports the DO NOTHING action, which returns no error.
