fix: ensure (a?.b)() has proper this (#11623)

* fix: ensure (a?.b)() has proper this

* let test be more restrictive

* fix: transformed member call should preserve computed

* chore: revamp test files

* refactor: simplify

* fix: unwrap parthenthesizedExpression

* add loose test cases

* add `(a?.#b)()` support

* add with-transform test cases

* Update packages/babel-plugin-proposal-optional-chaining/src/index.js

Co-authored-by: Justin Ridgewell <justin@ridgewell.name>

* address review comments

* update test fixtures

Co-authored-by: Justin Ridgewell <justin@ridgewell.name>

packages/babel-helper-create-class-features-plugin/src/fields.js

@@ -241,6 +241,15 @@ const privateNameHandlerSpec = {
     ]);
   },
 
+  boundGet(member) {
+    this.memoise(member, 1);
+
+    return t.callExpression(
+      t.memberExpression(this.get(member), t.identifier("bind")),
+      [this.receiver(member)],
+    );
+  },
+
   set(member, value) {
     const { classRef, privateNamesMap, file } = this;
     const { name } = member.node.property.id;
@@ -323,6 +332,13 @@ const privateNameHandlerLoose = {
     });
   },
 
+  boundGet(member) {
+    return t.callExpression(
+      t.memberExpression(this.get(member), t.identifier("bind")),
+      [t.cloneNode(member.node.object)],
+    );
+  },
+
   simpleSet(member) {
     return this.get(member);
   },