don't require everything by default

Summary:
We're already explicitly checking all the modules we can find w/ Require::Everything when we do transaction.run

The other reachable modules are all 3p deps, we don't need to keep all their ASTs and bindings and answers in memory, so the default require level can be Exports

2x speedup, 10x memory usage reduction

fixes #1714

Reviewed By: rchen152

Differential Revision: D91727690

fbshipit-source-id: 771f74bac7d8111763eb45d775f7ff049d6c29bf

Author: yangdanny97

pyrefly/lib/commands/report.rs

@@ -454,7 +454,7 @@ impl ReportArgs {
         let holder = Forgetter::new(state, false);
         let handles = Handles::new(expanded_file_list);
         let mut forgetter = Forgetter::new(
-            holder.as_ref().new_transaction(Require::Everything, None),
+            holder.as_ref().new_transaction(Require::Exports, None),
             true,
         );