Add due date and description fields to Todoist To-do entity

[allenporter]

Proposed change

Add Todoist Due date and description fields.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
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• The code change is tested and works locally.
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[allenporter]

Merged to handle the due_datetime change. Thank you for handling the follow through on that fix.

[MartinHjelmare]

There are som test failures.

[allenporter]

There are som test failures.

Sorry about that, fixed. Not sure what I messed up there. Passes now.

[MartinHjelmare]

Thanks!