Add Rust NewType Support

Is it supported already and im doing something wrong?

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, SpacetimeType)]
pub struct AccountId(pub u64);

#[table(name = account)]
pub struct Account {
    #[primary_key]
    #[auto_inc]
    pub id: AccountId,
    pub created_at: Timestamp,
}

1. proc-macro derive panicked
   message: called `Option::unwrap()` on a `None` value
2. proc-macro panicked: called `Option::unwrap()` on a `None` value

the trait bound `for<'de> schema::account::AccountId: spacetimedb::Deserialize<'de>` is not satisfied.
the column type `schema::account::AccountId` does not implement `SpacetimeType`
   table column types all must implement `SpacetimeType`
   if you own the type, try adding `#[derive(SpacetimeType)]` to its definition
   the following other types implement trait `spacetimedb::SpacetimeType`:

Start by reproducing the reported proc-macro and trait-bound errors with the AccountId and Account example from the issue. Trace the derive and table-column type handling to determine where the newtype is rejected; done means this example compiles and the resulting type supports the required serialization and SpacetimeType behavior.