Add an interface for initialization of vars without an explicit initializer (#6934)

When a `var` is not explicitly given an initializer, initialize it in
one of two ways:

* If its type implements the new interface `Core.Default`, call
`Core.Default.Op` to initialize it.
* Otherwise, if its type implements `UnformedInit`, leave it in an
unformed state. For now, this is always an uninitialized state, but that
will change in the future.
* If neither of those apply, the `var` declaration is ill-formed.

This is a step towards implementing leads decision #6739 and proposals
#257 and #5913.

Assisted-by: Gemini 3.1 Pro via Antigravity

---------

Co-authored-by: Geoff Romer <gromer@google.com>

toolchain/check/eval.cpp

@@ -1837,6 +1837,7 @@ static auto MakeConstantForBuiltinCall(EvalContext& eval_context,
           SemIR::IntValue{.type_id = call.type_id, .int_id = int_id}, phase);
     }
 
+    case SemIR::BuiltinFunctionKind::MakeUninitialized:
     case SemIR::BuiltinFunctionKind::PrintChar:
     case SemIR::BuiltinFunctionKind::PrintInt:
     case SemIR::BuiltinFunctionKind::ReadChar: