Utilize batchCheck within listRelations

[evanmay]

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Describe the problem you'd like to have solved

listRelations uses clientBatchCheck to evaluate the relations passed in. With the addition of batchCheck, this is not the most efficient way to query the OpenFGA server.

Describe the ideal solution

Follow the pattern established with clientBatchCheck and batchCheck

• Rename the existing listRelations to clientListRelations
• Add new listRelations method that uses batchCheck

Alternatives and current workarounds

Alternative:

• add a boolean flag to listRelations for useServerBatchCheck defaulted to false. Nonbreaking change, but does not follow precedent and boolean parameters for functions is generally an anti-pattern.

Workaround: Do not use listRelations and instead call batchCheck directly from code, then map the results to return the same format.

Additional context

Add any other context or screenshots about the feature request here.