[Multithread] Implement the NOT discriminant.

Implement the NOT discriminant that will allow two systems to run in parallel even if they fetch the same components:

void system_1(Query<Comp1, Comp2, Not<Comp3>>  &p_query){}
void system_2(Query<Comp1, Not<Comp2>, Comp3>  &p_query){}

Even if system_1 and system_2 are fetching Comp1, the Not filter prevent the query to collide, so both can run in parallel.

Moving the proposal to discussions to keep the issue just for things to fix.

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