Stable API - Make ReactDevToolsSettingsManagerModule and ReactDevToolsRuntimeSettingsModule internal (#47373)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/47373

Users should not depend on `ReactDevToolsSettingsManagerModule` directly hence I'm making it internal.
I expect to breakages in OSS as there no usages at all:
https://github.com/search?type=code&q=NOT+is%3Afork+NOT+org%3Afacebook+com.facebook.react.modules.reactdevtoolssettings.ReactDevToolsSettingsManagerModule
https://github.com/search?type=code&q=NOT+is%3Afork+NOT+org%3Afacebook+com.facebook.react.modules.devtoolsruntimesettings.ReactDevToolsRuntimeSettingsModule

Changelog:
[Android] [Breaking] - Stable API - Make ReactDevToolsSettingsManagerModule and ReactDevToolsRuntimeSettingsModule internal

Reviewed By: javache

Differential Revision: D65421030

fbshipit-source-id: e9d701af6cde25133f7b3ff9b07b678a7710852c