Add nestAnyEq filter function to allow testing array membership for nested objects

This allows using anyEq on something like

```
Foo
    lst [Text]
Bar
    foo Foo
```

Then can query like

```
BarFoo &->. FooLst `nestAnyEq` "Hello World"
```

I also would like to add a function to help filtering on a member of a pair.  Persistent has a PersistField instance of (,) which turns into a list, and mongo queries can access each element of the list using something like `field.0` or `field.1`.  But I am not sure what name for this operator.  Have separate fst/snd? Or something like "BarFoo &->. FooLst `tuple` First `nestEq` "Hello"