fix: postprocessing error for yt-dlp by sanitizing file names in FileWriteToolkit

[parthshr370]

Description

Solves issue in OWL - https://github.com/camel-ai/owl/issues/346

file names generated from video titles (or other metadata) often include spaces and special characters

when calls ytdlp it passes these strings directly

need to sanitize the way file_write_toolkit works - removes dot(.) dash(-) with underscore(_)

added a test function for the same

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cc @Wendong-Fan