[improvements] Update tests - Export SQL.Cache

[ulfox]

[tests] remove test-dbs at the end

[cache] export SQL.Cache

Before we had Cache struct exported but SQL.cache unexported

Now we have both objects exported

[tests] update tests

Include addiotional test cases

TestUpsert:

• Add arrays
• Add arrays of maps
• Add map with arrays
• Add map with integers

TestGetSingle:

• Get key with map values

TestGetPath:

• Test array out of range errors

TestDelete:

• Test delete missing key errors

TestGet:

• Include additional match that has a map as value rather than a string