Make TextInput descriptors and prop conversion helpers private

Summary:
Lower the following `react/renderer/components/textinput` headers from "for frameworks" to private:

Platform component descriptors:
- Android `androidtextinput/AndroidTextInputComponentDescriptor.h`
- iOS and macOS `iostextinput/TextInputComponentDescriptor.h`

All three classes are `final`, so they cannot be extended, and they are registered only by React Native's own platform glue (the Android core components registry and the iOS TextInput component view).

Prop conversion helpers:
- `baseConversions.h` (conversions for the shared text input enums)
- iOS and macOS `iostextinput/propsConversions.h` (iOS/macOS text input trait parsers)

These are only included by the module's own props sources (`BaseTextInputProps.cpp` and the platform `TextInputProps.cpp` / `AndroidTextInputProps.cpp`).

Changelog: [Internal]

Differential Revision: D123643375

Author: coado

packages/react-native/ReactCommon/react/renderer/components/textinput/baseConversions.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/FrameworksGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include <React/RendererCore.h>
 #include <react/renderer/components/textinput/basePrimitives.h>

packages/react-native/ReactCommon/react/renderer/components/textinput/platform/android/react/renderer/components/androidtextinput/AndroidTextInputComponentDescriptor.h

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

packages/react-native/ReactCommon/react/renderer/components/textinput/platform/ios/react/renderer/components/iostextinput/TextInputComponentDescriptor.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/FrameworksGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include <React/RendererCore.h>
 #include <react/renderer/components/iostextinput/TextInputShadowNode.h>

packages/react-native/ReactCommon/react/renderer/components/textinput/platform/ios/react/renderer/components/iostextinput/propsConversions.h

@@ -7,7 +7,7 @@
 
 #pragma once
 
-#include <react/cxxstableapi/FrameworksGuard.h>
+#include <react/cxxstableapi/PrivateGuard.h>
 
 #include <React/Debug.h>
 #include <React/RendererCore.h>