Properly support opaques

By letting the solver take control of them (reveal them when needed and define them when needed), by providing them in the `TypingMode` plus few helpers.

Author: ChayimFriedman2

src/tools/rust-analyzer/.typos.toml

@@ -33,6 +33,7 @@ trivias = "trivias"
 thir = "thir"
 jod = "jod"
 tructure = "tructure"
+taits = "taits"
 
 [default.extend-identifiers]
 anc = "anc"

src/tools/rust-analyzer/crates/hir-ty/src/autoderef.rs

@@ -38,7 +38,7 @@ pub fn autoderef<'db>(
     env: Arc<TraitEnvironment<'db>>,
     ty: Canonical<'db, Ty<'db>>,
 ) -> impl Iterator<Item = Ty<'db>> + use<'db> {
-    let mut table = InferenceTable::new(db, env);
+    let mut table = InferenceTable::new(db, env, None);
     let ty = table.instantiate_canonical(ty);
     let mut autoderef = Autoderef::new_no_tracking(&mut table, ty);
     let mut v = Vec::new();