[starlark] Use namespace in GlobalsBuilder

Summary:
Instead of a struct.

This temporarily regresses docs somewhat, but these were already useless anyway, and the rest of the stack fixes them

I updated the generated docs of promptlark as a part of this diff, there's nothing checking that those stay up to date though, which is a bit unfortunate

Test Plan: CI

Reviewed By: stepancheg

Differential Revision: D61778031

fbshipit-source-id: 5601cfc90ae9815c8fcbc10d9413de5c133d35e5

antlir/bzl/shape2/bzl2ir.rs

@@ -416,7 +416,7 @@ impl FileLoader for Dependencies {
             let module = Module::new();
             {
                 let mut evaluator: Evaluator = Evaluator::new(&module);
-                let globals = bzl_globals().with_struct("shape_impl", shape).build();
+                let globals = bzl_globals().with_namespace("shape_impl", shape).build();
                 evaluator
                     .eval_module(ast, &globals)
                     .map_err(starlark::Error::into_anyhow)?;

antlir/bzl/starlark_unittest/src/starlark_unittest.rs

@@ -236,9 +236,9 @@ fn globals() -> Globals {
         LibraryExtension::Json,
         LibraryExtension::Typing,
     ])
-    .with_struct("unittest", unittest)
+    .with_namespace("unittest", unittest)
     .with(saving_fail)
-    .with_struct("native", native)
+    .with_namespace("native", native)
     .build()
 }