cancel_tasks parameters are inconsistant

[sanders41]

Description
params in cancel_tasks from Client are required, but in TaskHandler they are optional.

In TaskHandler if params is set to None it defaults to {} meaning the information is sent to the Meilisearch server but it won't do anything. I think either the None params should default to something that makes sense ({"statuses": "enqueued, processing"} maybe?) and the parms in Client should be made options, or params in TaskHandler should also be required.

Expected behavior
Parameters should be consistant.

Current behavior
What happened.

Screenshots or Logs
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Environment (please complete the following information):

• OS: All
• Meilisearch version: All
• meilisearch-python version: v0.26.0