Move various token stream things from rustc_parse to rustc_ast.

Specifically: `TokenCursor`, `TokenTreeCursor`,
`LazyAttrTokenStreamImpl`, `FlatToken`, `make_attr_token_stream`,
`ParserRange`, `NodeRange`. `ParserReplacement`, and `NodeReplacement`.
These are all related to token streams, rather than actual parsing.

This will facilitate the simplifications in the next commit.

compiler/rustc_parse/src/lib.rs

@@ -5,7 +5,6 @@
 #![allow(rustc::diagnostic_outside_of_impl)]
 #![allow(rustc::untranslatable_diagnostic)]
 #![cfg_attr(bootstrap, feature(let_chains))]
-#![feature(array_windows)]
 #![feature(assert_matches)]
 #![feature(box_patterns)]
 #![feature(debug_closure_helpers)]