fix(asr-worker): fix inference on audios as embedded documents

[ClemDoum]

Description

Inference on embedded documents failed because the Document.path of these documents is actually the path of the parent/root document.
In practice these files are located under: artifact_dir/project/id[0:2]/id[2:4]/raw

However inference can't run on file without extension because the file extension is used to handler file conversion into the inference file format.

Hence when running inference on embedded document we create a symlink to the original document with the proper file extension.

Changes

asr-worker

Fixed

• propery handle inference on audio files stored as embedded files by creating a symlink to the worker workdir with the correct audio file extension

datashare-python

Added

• added a FilesystemDocument object to reprensent a DS doc which can be stored on the original filesystem, stored as an artifact or copied into a workdir by a worker
• added artifacts_root, workdir, docs_root to WorkerConfig

Changed

• improved activity_contextual_id to be less verbose (only log wf info by default)