bug: FileBasedLock parent dir may not exist

[mackenzie-grimes-noaa]

Linear Issue

N/A (hotfix)

Changes

• Ensure that all parent directories of the target FileBasedLock exist before trying to create a .lock file

Explanation

The previous PR (#104), once used by DAS, was throwing uncaught exceptions:

FileNotFoundError: [Errno 2] No such file or directory: '/local_data/tmp/NBM/CONUS/2025/04/30/NBM_CONUS_20250430210000_20250501130000.grib2.idx.lock'

We failed to consider when FileBasedLock would be used to write data to a directory that didn't yet exist.

Now FileBasedLock will create (but not clean up) any parent directories above the provided filepath, before creating the .lock.