Add initial feature logic for Terms and Conditions (TC) acknowledgements

This commit introduces the initial logic for handling Terms and
Conditions (TC) acknowledgements in the General Commissioning cluster.
The logic includes support for setting and checking TC acknowledgements
and versions during the commissioning process.

Changes include:
- Handling TC acknowledgements and TC acknowledgement version in the
  pairing command.
- Logic to read TC attributes and check TC acceptance in the General
  Commissioning server.
- Introduction of classes to manage TC acceptance logic.
- Initialization and use of TC providers in the server setup.
- Addition of a new commissioning stage for TC acknowledgements in the
  commissioning flow.

The feature logic is currently disabled and will be enabled in an
example in a subsequent commit.

src/app/FailSafeContext.cpp

@@ -86,9 +86,12 @@ void FailSafeContext::ScheduleFailSafeCleanup(FabricIndex fabricIndex, bool addN
     SetFailSafeArmed(false);
 
     ChipDeviceEvent event{ .Type                 = DeviceEventType::kFailSafeTimerExpired,
-                           .FailSafeTimerExpired = { .fabricIndex                    = fabricIndex,
-                                                     .addNocCommandHasBeenInvoked    = addNocCommandInvoked,
-                                                     .updateNocCommandHasBeenInvoked = updateNocCommandInvoked } };
+                           .FailSafeTimerExpired = {
+                               .fabricIndex                            = fabricIndex,
+                               .addNocCommandHasBeenInvoked            = addNocCommandInvoked,
+                               .updateNocCommandHasBeenInvoked         = updateNocCommandInvoked,
+                               .updateTermsAndConditionsHasBeenInvoked = mUpdateTermsAndConditionsHasBeenInvoked,
+                           } };
     CHIP_ERROR status = PlatformMgr().PostEvent(&event);
 
     if (status != CHIP_NO_ERROR)

src/app/FailSafeContext.h

@@ -56,6 +56,7 @@ class FailSafeContext
     void SetUpdateNocCommandInvoked() { mUpdateNocCommandHasBeenInvoked = true; }
     void SetAddTrustedRootCertInvoked() { mAddTrustedRootCertHasBeenInvoked = true; }
     void SetCsrRequestForUpdateNoc(bool isForUpdateNoc) { mIsCsrRequestForUpdateNoc = isForUpdateNoc; }
+    void SetUpdateTermsAndConditionsHasBeenInvoked() { mUpdateTermsAndConditionsHasBeenInvoked = true; }
 
     /**
      * @brief
@@ -91,6 +92,7 @@ class FailSafeContext
     bool UpdateNocCommandHasBeenInvoked() const { return mUpdateNocCommandHasBeenInvoked; }
     bool AddTrustedRootCertHasBeenInvoked() const { return mAddTrustedRootCertHasBeenInvoked; }
     bool IsCsrRequestForUpdateNoc() const { return mIsCsrRequestForUpdateNoc; }
+    bool UpdateTermsAndConditionsHasBeenInvoked() { return mUpdateTermsAndConditionsHasBeenInvoked; }
 
     FabricIndex GetFabricIndex() const
     {
@@ -109,8 +111,9 @@ class FailSafeContext
     bool mUpdateNocCommandHasBeenInvoked   = false;
     bool mAddTrustedRootCertHasBeenInvoked = false;
     // The fact of whether a CSR occurred at all is stored elsewhere.
-    bool mIsCsrRequestForUpdateNoc = false;
-    FabricIndex mFabricIndex       = kUndefinedFabricIndex;
+    bool mIsCsrRequestForUpdateNoc               = false;
+    FabricIndex mFabricIndex                     = kUndefinedFabricIndex;
+    bool mUpdateTermsAndConditionsHasBeenInvoked = false;
 
     /**
      * @brief
@@ -140,11 +143,12 @@ class FailSafeContext
     {
         SetFailSafeArmed(false);
 
-        mAddNocCommandHasBeenInvoked      = false;
-        mUpdateNocCommandHasBeenInvoked   = false;
-        mAddTrustedRootCertHasBeenInvoked = false;
-        mFailSafeBusy                     = false;
-        mIsCsrRequestForUpdateNoc         = false;
+        mAddNocCommandHasBeenInvoked            = false;
+        mUpdateNocCommandHasBeenInvoked         = false;
+        mAddTrustedRootCertHasBeenInvoked       = false;
+        mFailSafeBusy                           = false;
+        mIsCsrRequestForUpdateNoc               = false;
+        mUpdateTermsAndConditionsHasBeenInvoked = false;
     }
 
     void FailSafeTimerExpired();

src/app/chip_data_model.cmake

@@ -84,8 +84,9 @@ function(chip_configure_data_model APP_TARGET)
     # CMAKE data model auto-includes the server side implementation
     target_sources(${APP_TARGET} ${SCOPE}
         ${CHIP_APP_BASE_DIR}/server/AclStorage.cpp
-        ${CHIP_APP_BASE_DIR}/server/DefaultAclStorage.cpp
         ${CHIP_APP_BASE_DIR}/server/CommissioningWindowManager.cpp
+        ${CHIP_APP_BASE_DIR}/server/DefaultAclStorage.cpp
+        ${CHIP_APP_BASE_DIR}/server/DefaultTermsAndConditionsProvider.cpp
         ${CHIP_APP_BASE_DIR}/server/Dnssd.cpp
         ${CHIP_APP_BASE_DIR}/server/EchoHandler.cpp
         ${CHIP_APP_BASE_DIR}/server/OnboardingCodesUtil.cpp