Refactor logo usage

Also:
* Move logos to a central location
* Make the loading spinner color-scheme-aware
* Recreate `OverviewPageHeader`, `HomeIcon`, `HeaderLogo`, `SolutionTitle`, `Welcome`, `Overview` tests
* Enhance `ExitFullScreenButton`, `Header` tests
* Tinified favicon assets

Signed-off-by: Miki <miki@amazon.com>

packages/osd-dev-utils/src/serializers/flat_object_serializer.ts

@@ -0,0 +1,100 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Any modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+const walk = (value: any, path: string[] = [], collector: string[] = []) => {
+  let objValue;
+  switch (Object.prototype.toString.call(value)) {
+    case '[object Map]':
+    case '[object WeakMap]':
+      objValue = Object.fromEntries(value);
+      break;
+
+    case '[object Set]':
+    case '[object WeakSet]':
+      objValue = Array.from(value);
+      break;
+
+    case '[object Object]':
+    case '[object Array]':
+      objValue = value;
+      break;
+
+    case '[object RegExp]':
+    case '[object Function]':
+    case '[object Date]':
+    case '[object Boolean]':
+    case '[object Number]':
+    case '[object Symbol]':
+    case '[object Error]':
+      collector.push(`${path.join('.')} = ${value.toString()}`);
+      break;
+
+    case '[object Null]':
+      collector.push(`${path.join('.')} = null`);
+      break;
+
+    case '[object Undefined]':
+      collector.push(`${path.join('.')} = undefined`);
+      break;
+
+    case '[object String]':
+      collector.push(`${path.join('.')} = ${JSON.stringify(value)}`);
+      break;
+
+    case '[object BigInt]':
+      collector.push(`${path.join('.')} = ${value.toString()}n`);
+      break;
+
+    default:
+      if (value instanceof Object.getPrototypeOf(Uint8Array)) {
+        objValue = Array.from(value);
+      }
+  }
+
+  if (!objValue) return collector;
+
+  if (Array.isArray(objValue)) {
+    objValue.forEach((v, i) => {
+      walk(v, [...path, i.toString()], collector);
+    });
+  } else {
+    // eslint-disable-next-line guard-for-in
+    for (const key in objValue) {
+      walk(objValue[key], [...path, key], collector);
+    }
+  }
+
+  return collector;
+};
+export const flatObjectSerializer = {
+  test: (value: any) =>
+    ['[object Object]', '[object Array]'].includes(Object.prototype.toString.call(value)),
+  serialize: (value: any) => walk(value).sort().join('\n'),
+};

packages/osd-dev-utils/src/serializers/index.ts

@@ -34,3 +34,4 @@ export * from './recursive_serializer';
 export * from './any_instance_serizlizer';
 export * from './replace_serializer';
 export * from './strip_promises_serizlizer';
+export * from './flat_object_serializer';

src/core/common/index.ts

@@ -0,0 +1,6 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+export * from './logos';