Add BluetoothLeAudioCodecsProvider Unit Test

Add unit test for BluetoothLeAudioCodecsProvider and simplify
the public interface of BluetoothLeAudioCodecsProvider class

Bug: 253569201
Test: atest VtsHalBluetoothAudioTargetTest
Test: atest BluetoothLeAudioCodecsProviderTest
Test: manual test
Change-Id: I064eb4058b129a571cf9dbb91b85bafe7236b735
diff --git a/bluetooth/audio/utils/aidl_session/BluetoothLeAudioCodecsProvider.h b/bluetooth/audio/utils/aidl_session/BluetoothLeAudioCodecsProvider.h
index 402235f..e879984 100644
--- a/bluetooth/audio/utils/aidl_session/BluetoothLeAudioCodecsProvider.h
+++ b/bluetooth/audio/utils/aidl_session/BluetoothLeAudioCodecsProvider.h
@@ -31,8 +31,13 @@
 
 class BluetoothLeAudioCodecsProvider {
  public:
+  static std::optional<setting::LeAudioOffloadSetting>
+  ParseFromLeAudioOffloadSettingFile();
   static std::vector<LeAudioCodecCapabilitiesSetting>
-  GetLeAudioCodecCapabilities();
+  GetLeAudioCodecCapabilities(
+      const std::optional<setting::LeAudioOffloadSetting>&
+          le_audio_offload_setting);
+  static void ClearLeAudioCodecCapabilities();
 
  private:
   static inline std::unordered_map<std::string, setting::Configuration>