Start work on a Buffer API for requesting autoindent on the next parse

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

crates/zed/languages/rust/indents.scm

@@ -0,0 +1,10 @@
+[
+    (where_clause)
+    (field_expression)
+    (call_expression)
+] @indent
+
+(_ "[" "]" @end) @indent
+(_ "<" ">" @end) @indent
+(_ "{" "}" @end) @indent
+(_ "(" ")" @end) @indent

crates/zed/src/language.rs

@@ -22,6 +22,8 @@ fn rust() -> Language {
         .unwrap()
         .with_brackets_query(load_query("rust/brackets.scm").as_ref())
         .unwrap()
+        .with_indents_query(load_query("rust/indents.scm").as_ref())
+        .unwrap()
 }
 
 fn load_query(path: &str) -> Cow<'static, str> {