Macro lazy_input

macro_rules! lazy_input {
    (
        $(
            $variant:ident (
                $( $field:ident : $ty:ty ),* $(,)?
            )
        ),* $(,)?
    ) => { ... };
}

Defines the LazyInput enum for LazyBalance operations.

Each variant represents an operation input, with typed fields encoded as tuples and mapped via FromTag / TryIntoTag.

Enables type-safe, tag-driven dispatch into LazyBalance::BalanceFamily plugins.