Bounded integer types cannot be deserialized from a string

[DrChat]

Types such as LimitedU32 cannot be deserialized from string types.

This makes it hard to directly use generated types to deserialize data in-the-wild, such as data that comes from HTTP query parameters (whose values are always interpreted as strings).

For a concrete example, see bluepds here:
https://github.com/DrChat/bluepds/blob/e73820233790c5c1db24644512814628bf0a43ea/src/endpoints/sync.rs#L239-L248

I had to redeclare the generated type and remove all cases of LimitedU32 because they cannot be deserialized from strings.

More context/reading:
serde-rs/serde#908
serde-rs/json#412