Add file lock to support mutli processes usage

[jnhyperion]

Using filelock can ultimately solve the process safe problem without specifying any os env variables.

Also, this does not conflict with WDM_LOCAL or pytest-xdist support.

[stuaxo]

Are there circumstances (e.g. a reboot) where the lock could be there after the app is terminated in an unexpected way?

I wonder if an option to delete an already present lock is needed ?

[jnhyperion]

No, in my understanding, the lock is in OS io level, it does not matter with the .lock file exists or not.

When a process holds a file lock and it's killed somehow, the OS io level lock will be automatically released, it will not impact the next lock acquire.

[SergeyPirogov]

It will not work. The multiprocess issue happen because several processes tries to write into in file/folder

[jnhyperion]

@SergeyPirogov I don't understand why you're saying it will not work. Library filelock aims to solve the problem exactly you described "several processes tries to write into in file/folder".