chore: Replace List with Sequence

[hh-space-invader]

All Submissions:

ref #784

• Contributions should target the dev branch. Did you create your branch from dev?
• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

New Feature Submissions:

1. Does your submission pass tests?
2. Have you installed pre-commit with pip3 install pre-commit and set up hooks with pre-commit install?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

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[joein]

@hh-space-invader we can't modify anything under http or grpc manually
http (and, consequently, models can be modified only by modifying the rest generator (another repo)
grpc can only be modified by altering either proto files or the generator