apps: Add BLE Audio Broadcast Sink sample

The sample scans for broadcasting devices and synchronizes to the one
that Broadcast Name in EXT_ADV matches APP_BROADCAST_NAME if any��.
If the APP_BROADCAST_NAME is unset, the application will attempt to
synchronize to the first broadcaster found.

Signed-off-by: Mariusz Skamra <mariusz.skamra@codecoup.pl>

apps/bleaudio_broadcast_sink/README.md

@@ -0,0 +1,16 @@
+#### Bluetooth: LE Audio Broadcast Sink demo
+
+##### Overview
+********
+
+This is a application demonstrating a Bluetooth LE Audio Broadcast Sink
+implementation.
+
+The sample starts scanning looking for a available broadcasts to sync to.
+If the APP_BROADCAST_NAME is set in syscfg.yml the application will try to
+match the Broadcast Name in the received EXT_ADV with APP_BROADCAST_NAME.
+If the APP_BROADCAST_NAME is unset, the application will attempt to
+synchronize to the first broadcaster found.
+
+If the broadcast is encrypted, the APP_BROADCAST_CODE will be provided to
+the controller to decrypt the data.

apps/bleaudio_broadcast_sink/pkg.yml

@@ -0,0 +1,39 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF 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.
+#
+
+pkg.name: apps/bleaudio_broadcast_sink
+pkg.type: app
+pkg.description: LE Audio Broadcast Sink sample application.
+
+pkg.author: "Mariusz Skamra"
+pkg.email: "mariusz.skamra@codecoup.pl"
+pkg.homepage: "https://www.codecoup.pl/"
+pkg.keywords:
+
+pkg.deps:
+    - nimble/host
+    - nimble/host/util
+    - nimble/host/audio
+    - nimble/host/services/gap
+    - nimble/host/store/config
+    - "@apache-mynewt-core/kernel/os"
+    - "@apache-mynewt-core/sys/console"
+    - "@apache-mynewt-core/sys/log"
+    - "@apache-mynewt-core/sys/stats"
+    - "@apache-mynewt-core/sys/sysinit"
+    - "@apache-mynewt-core/sys/id"