Add more typeclass instances for NonEmptyText and NullableNonEmptyText

[curranosaurus]

In this PR, I added some typeclass instances for NonEmptyText and NullableNonEmptyText. These come from three sources.

1. I standardized the existing typeclass coverage between the two types.
2. I added some typeclasses instances that come from Text
3. I added a Hashable instance to both classes because that seems generally useful.

Adding NFData (category 2) required adding a dependency on deepseq.
Adding Hashable required adding a dependency on hashable.

If we prefer to keep this library low-dependency, I'm happy to remove those two instances. The instance I actually need for my work is Ord (NullableNonEmptyText n).

[curranosaurus]

CI is failing, but the error appears unrelated to my PR.

[MaxGabriel]

If we prefer to keep this library low-dependency, I'm happy to remove those two instances. The instance I actually need for my work is Ord (NullableNonEmptyText n).

deepseq is a dependency of text, and hashable is a dependency of aeson. This library depends on text and aeson so seems fine to me!

[curranosaurus]

If we prefer to keep this library low-dependency, I'm happy to remove those two instances. The instance I actually need for my work is Ord (NullableNonEmptyText n).

deepseq is a dependency of text, and hashable is a dependency of aeson. This library depends on text and aeson so seems fine to me!

Good point, I didn't think about it that way.