Add FileSystem.lock (#1869) #1677
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This commit introduces file locking capabilities to the Okio FileSystem.
For discussion of #1464
TODO
proper-lockfile?Key changes:
FileSystem.lock()method to acquire exclusive or shared locks on files.FileLockinterface for managing lock state and lifecycle.java.nio.channels.FileChannel.lock().FakeFileSystemLockfor testing purposes.FileSystemthrowIOExceptionas locking is not supported on these platforms by default.NioFileSystemWrappingFileSystemandJvmSystemFileSystemto delegate to the new locking mechanism.