refactor(ivy): Implement computeStaticStyling (#34418)

The `computeStaticStyling` will be used for computing static styling value during `firstCreatePass`.

The function takes into account static styling from the template as well as from the host bindings. The host bindings need to be merged in front of the template so that they have the correct priority.

PR Closes #34418

packages/core/test/util/stringify_spec.ts

@@ -0,0 +1,27 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+import {concatStringsWithSpace} from '@angular/core/src/util/stringify';
+
+describe('stringify', () => {
+  describe('concatStringsWithSpace', () => {
+    it('should concat with null', () => {
+      expect(concatStringsWithSpace(null, null)).toEqual('');
+      expect(concatStringsWithSpace('a', null)).toEqual('a');
+      expect(concatStringsWithSpace(null, 'b')).toEqual('b');
+    });
+
+    it('should concat when empty', () => {
+      expect(concatStringsWithSpace('', '')).toEqual('');
+      expect(concatStringsWithSpace('a', '')).toEqual('a');
+      expect(concatStringsWithSpace('', 'b')).toEqual('b');
+    });
+
+    it('should concat when not empty',
+       () => { expect(concatStringsWithSpace('before', 'after')).toEqual('before after'); });
+  });
+});