Pytket-quantinuum

- Updated pytket version requirement to 0.11.

- Contextual optimisation added to default compilation passes (except at optimisation level 0).

- Add `session` parameter to `QuantinuumAPI`. Creates a new session
if `None` is provided.
- Add facility to specify default `options` paramater to
`process_circuits()` and `submit_qasm()` when constructing backend, and
include this information in `backend_info`.
- Updated pytket version requirement to 1.7.

- Add `options` parameter to `process_circuits()` and `submit_qasm()`.
- Updated pytket version requirement to 1.6.

- Add new `QuantinuumAPIOffline` for allowing usage of the backend without API calls.
- New `api_handler` parameter for `QuantinuumBackend`, allowing to choose
online or offline options. Default value is the standard online api.
- Updated pytket version requirement to 1.5.

- Changed batching interface: `process_circuits` no longer batches, use
`start_batching` and `add_to_batch` methods to explicitly start and append to
batches.
- New `submit_qasm` backend method to enable direct submission of a QASM program.