Fix a bunch of parser/formatter bugs found in fuzzing

Notably:
* Unified how parens are formatted between (1) when we have a ParensAround, and (2) when we've decided an Apply needs to have parens
* Made unary minus require the be indented to the same level as any other expression continuation. (it used to accidentally have rules meant for binary operators applied)
* Don't apply extra indent to the backpassing continuation in the case that the call does itself require indentation
* Make `try@foo` correctly parse as `try @foo`, so that formatting doesn't change the tree when it adds that space
* Detect more cases where we need to outdent trailing e.g. {} blocks in applies
* Approximately a bagillion other things, 90% of which I added tests for, and none of which affected the formatting of examples or builtins

crates/compiler/test_syntax/fuzz/fuzz_targets/fuzz_module.rs

@@ -1,6 +1,6 @@
 #![no_main]
-use libfuzzer_sys::fuzz_target;
 use bumpalo::Bump;
+use libfuzzer_sys::fuzz_target;
 use test_syntax::test_helpers::Input;
 
 fuzz_target!(|data: &[u8]| {