Support creating tasks that reference invokable scripts

Proposal:
The python client should allow users to create tasks that reference scripts, see https://docs.influxdata.com/influxdb/cloud/process-data/manage-tasks/create-task/#create-a-task-that-references-a-script

Current behavior:
It is not possible to create tasks that reference invokable scripts.

Desired behavior:
It should be possible to create tasks that reference invokable scripts. This is already supported by InfluxDB Cloud, the python client just needs updated to support doing so.

Alternatives considered:
The alternative is to use a HTTP client directly (I dno what the status of this is in other, non-python clients, but I need to use python.)

Use case:
There are various resources published online by the Influx people about how and why to use invokable scripts and how these can be utilized from tasks (amongst other resources), so it would be good if the official python client was capable of supporting this.

Start with the linked InfluxDB Cloud documentation for creating a task that references an invokable script, then trace the Python client's task-creation API. The work is complete when the client can create tasks referencing invokable scripts, with coverage for that request shape.