[TieredStorage] TieredStorageFile -> TieredReadonlyFile and TieredWri… #86

Job	Run time
android (ubuntu-20.04, x86_64-linux-android)	2m 55s
ios (macos-11, aarch64-apple-ios)	6m 17s
android (ubuntu-20.04, aarch64-linux-android)	2m 59s
ios (macos-11, x86_64-apple-ios)	6m 30s
android (ubuntu-20.04, i686-linux-android)	3m 1s
ios (macos-11, aarch64-apple-darwin)	7m 0s
android (ubuntu-20.04, armv7-linux-androideabi)	3m 18s
ios (macos-11, x86_64-apple-darwin)	7m 45s
error_reporting	0s
	39m 45s

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