Add support for "not tag_value" filter

Currently, `!tag::()` can be used for filtering entities without the `Static ` tag. However, this does not seem to be evenly supported for `!tag_value`.

For instance, this snippet compiles but the assertion is not fulfilled:

```rust
use legion::prelude::*;

#[derive(Clone, Copy, Debug, PartialEq)]
struct Position {
x: f32,
y: f32,
}

#[derive(Clone, Copy, Debug, PartialEq)]
struct Model(usize);

fn main() {
let mut world = Universe::new().create_world();

world.insert((Model(1),), vec![(Position { x: 0.0, y: 0.0 },)]);
world.insert((Model(2),), vec![(Position { x: 1.0, y: 1.0 },)]);
world.insert((Model(3),), vec![(Position { x: 2.0, y: 2.0 },)]);

let not_model_1 = !tag_value(&Model(1));
// ^ here

let count = Read::::query()
.filter(not_model_1)
.iter(&world)
.count();

assert_eq!(count, 2) // <= count is 0
}
```

Is this an intended behavior ?