Make host target tracing implementation headers private

Summary:
Mark the following headers as private instead of for-frameworks. All of them are implementation details of how the host target records and serializes a trace, and no for-frameworks header includes them:

- `HostTracingProfileSerializer` transforms a `HostTracingProfile` into serialized trace events. It is only used by its own source and `HostTargetTracing.h`.
- `HostTargetTracing.h` provides `emitNotificationsForTracingProfile`, which uses the serializer to send a captured profile to frontend channels as `Tracing.dataCollected` events followed by `Tracing.tracingComplete`. It is only used by `HostTarget.cpp` and `TracingAgent.cpp`, and was already not exported in Buck.
- `HostTargetTraceRecording` holds the state of an in-progress host trace recording. `HostTarget.h` only forward-declares it, and it is only used by `HostTarget.cpp`, `HostTargetTraceRecording.cpp` and `HostTargetTracing.cpp`.
- `TimeWindowedBuffer` is a generic buffer that keeps only elements inside a time window. It is only used by `HostTargetTraceRecording` and its own unit test.
- `TracingAgent` handles the CDP `Tracing.start` and `Tracing.stop` requests for the host agent. It is only used by `HostAgent.cpp` and `TracingAgent.cpp`, and was already not exported in Buck.

Headers that include one another change together: `HostTargetTracing.h` includes `HostTracingProfileSerializer.h`, and `HostTargetTraceRecording.h` stores a `TimeWindowedBuffer` by value, so keeping either includer for-frameworks would expose a private header. `HostTracingProfile.h`, `FrameTimingSequence.h`, `TraceRecordingState.h` and `TracingCategory.h` stay for-frameworks because other for-frameworks headers include them.

React Native's own targets define `RN_BUILDING`, so the private guard does not affect them.

Changelog: [Internal]

Differential Revision: D122791607

Author: coado

packages/react-native/ReactCommon/jsinspector-modern/HostTargetTraceRecording.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/FrameworksGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include "HostAgent.h"
 #include "HostTarget.h"

packages/react-native/ReactCommon/jsinspector-modern/HostTargetTracing.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/FrameworksGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include "InspectorInterfaces.h"
 

packages/react-native/ReactCommon/jsinspector-modern/TracingAgent.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/FrameworksGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include "HostTarget.h"
 #include "InspectorInterfaces.h"

packages/react-native/ReactCommon/jsinspector-modern/tracing/HostTracingProfileSerializer.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/FrameworksGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include "FrameTimingSequence.h"
 #include "HostTracingProfile.h"

packages/react-native/ReactCommon/jsinspector-modern/tracing/TimeWindowedBuffer.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/FrameworksGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include <algorithm>
 #include <functional>