v14: fix: Performance and high memory usage of relation hint calculation #4588
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* Calculation of hint message when requested relation is not present in schema cache requires creation of a FuzzySet (to use fuzzy search to find candidate tables). For schemas with many tables it is costly. This patch introduces dbTablesFuzzyIndex in SchemaCache to memoize the FuzzySet creation. * Additionally, because of FuzzySet large memory requirements, this patch introduces a limit of 500 relations per schema, above which FuzzySet is not created and hint calculation disabled. (cherry picked from commit e592d56)
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Backport for #4472.