Prevent Zero Value Specification for index_granularity

Why it matters

This feature addresses the issue where users could mistakenly set index_granularity to zero, an invalid value that could cause unexpected behavior or errors. By enforcing a restriction against zero values, it ensures data integrity and reduces configuration errors.

How to use it

Users simply need to specify a positive, non-zero value for index_granularity in their table definitions or settings. Attempts to set index_granularity = 0 will be blocked to prevent invalid configurations.