Fix trait-bound method lookup ambiguity

Closes #7394.

Author: tritao

sway-core/src/semantic_analysis/namespace/mod.rs

@@ -22,6 +22,7 @@ pub(crate) use trait_map::IsImplInterfaceSurface;
 pub(crate) use trait_map::IsImplSelf;
 pub(super) use trait_map::ResolvedTraitImplItem;
 pub(crate) use trait_map::TraitEntry;
+pub(crate) use trait_map::TraitKey;
 pub use trait_map::TraitMap;
 pub use trait_map::TryInsertingTraitImplOnFailure;