Add test support for intrinsic sized nodes (#1671)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1671

This diff adds support for intrinsic sizing in generated tests. This is done by importing a testing font called "Ahem" which, as used, has an exact width and height of 10px for each character. Support has been added for C++, Java, and Javascript generated tests.

Reviewed By: NickGerleman

Differential Revision: D58307002

fbshipit-source-id: e1dcc1e03310d35a32e0c70f71994880d8f7de55

javascript/tests/generated/YGAbsolutePositionTest.test.ts

@@ -4,10 +4,11 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<9c27293180ef7ffd5b683046588f9dd7>>
+ * @generated SignedSource<<133e2d77cd6267d4bfb0fe992d437fd1>>
  * generated by gentest/gentest-driver.ts from gentest/fixtures/YGAbsolutePositionTest.html
  */
 
+import { instrinsicSizeMeasureFunc } from '../tools/utils.ts'
 import Yoga from 'yoga-layout';
 import {
   Align,