Express contracts as part of function header and lower it to the contract lang items

includes post-developed commit: do not suggest internal-only keywords as corrections to parse failures.

includes post-developed commit: removed tabs that creeped in into rustfmt tool source code.

includes post-developed commit, placating rustfmt self dogfooding.

includes post-developed commit: add backquotes to prevent markdown checking from trying to treat an attr as a markdown hyperlink/

includes post-developed commit: fix lowering to keep contracts from being erroneously inherited by nested bodies (like closures).

Rebase Conflicts:
 - compiler/rustc_parse/src/parser/diagnostics.rs
 - compiler/rustc_parse/src/parser/item.rs
 - compiler/rustc_span/src/hygiene.rs

Remove contracts keywords from diagnostic messages

compiler/rustc_hir/src/hir.rs

@@ -2598,6 +2598,8 @@ pub enum LocalSource {
     /// A desugared `expr = expr`, where the LHS is a tuple, struct, array or underscore expression.
     /// The span is that of the `=` sign.
     AssignDesugar(Span),
+    /// A contract `#[ensures(..)]` attribute injects a let binding for the check that runs at point of return.
+    Contract,
 }
 
 /// Hints at the original code for a `match _ { .. }`.