Xtdb

- Bugfix: only lowercase boolean parameters

- Documentation updates
- Error message propagation

- Support for or-join
- Support for not-join
- Better connection handling for stale connections after bad queries

- Generic support for predicates
- Support for not-clauses
- HTTP adapter argument forwarding in client
- `:order-by` support
- Support for `:in`

- Better logging using an "XTDB" logger
- Support querying `FindWhere` clause in Client
- Readme updates
- Example updates

- Add datalog language layer to simplify query building and add functionality to build queries outside the ORM-centered sessions.
- Support for or, query timeouts and regular field aliasing.