dev: Improve diagnostics for wrong component embeddable name

[barak-b-starkware]

Within a starknet contract piece of code, if I use a component as follows:

#[abi(embed_v0)]
impl InternalName = SomeComponent::EmbeddableAsName<ContractState>;

and the EmbeddableAsName is wrong, I get and error: Trait not found. it appears at the top of the contract where #[starknet::contract] is placed.
IMO, It should imply which trait is not found or at least point to the component that caused the error.

[orizi]

Is this the only diagnostic you get?