configure tcins to be of explicit size

[Jonathan-Zollinger]

Summary

some endpoints require tcins with only one arg, some permit multiple. this tcins object should either be permitted to specify the count accepted in the arg, or eliminate the custom object altogether

Proposed Solution

eliminate the custom object and use simple strings

Alternative

extend the collections class and somehow dictate the count of tcin values in a tcin object.

Requirements

all tcin-related queries still work. there's lots of tests with this, new tests are unnecessary.

Additional Context

case of tcins using different count is in the pdp query and product summaries query.

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