Redundant typeof BaseEntity typing

[Defus-E]

I noticed that both GraphQLDatabaseLoader and GraphQLQueryBuilder use generic extending typeof BaseEntity which is incorrect in some cases because Entity might not be extended from BaseEntity. It enables some difficulties to implement correct typing in real use. It seems everything works great if entity isn't extended from BaseEntity, so I think it's redundant typing. Please, fix it.

[script-sorcerer]

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