[Feature Proposal] Support replacing Windows reserved characters for `ActiveStorage::Filename#sanitized`

The sanitization provided by ActiveStorage::Filename#sanitized doesn’t include replacing all the reserved characters for Windows. I suggest it replace those characters by default too.

Out of curiosity I just checked linux reserved characters and it seems > should have been on that list too.

This looks like a pretty good first issue for someone wanting to get started with contributing to Rails.

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Thanks! I’ll create a PR.