clarify the session ID API properties
This documents the properties of the session ID APIs and includes them in the test suite.
Checklist
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Test suite updated with functionality tests -
Documentation updated
Reviewer's checklist:
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Any issues marked for closing are addressed -
There is a test suite reasonably covering new functionality or modifications -
Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTION.md
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This feature/change has adequate documentation added -
No obvious mistakes in the code