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Displays the PID of the SwiftPM instance currently holding the lock
Motivation:
Fixes https://github.com/swiftlang/swift-package-manager/issues/8528
Modifications:
Added a new abstraction for handling a .pid file which contains the pID of the currently running SwiftPM instance.
introduced the pidfileManipulator protocol and its implementation in pidFile struct to handle reading, writing, and deleting the PID file
Updated SwiftCommandState to use the pidFileManipulator to handle the pid file when attempting to acquire or release the lock.
Result:
Enhancement of knowing which processes are currently holding the lock + automatic cleanup