address_filter: Fix parsing of 'all'

[smalis-msft]

"all" should be treated as a special case here, not just a subrange. Otherwise it'll conflict with any other ranges. Fix parsing to handle this properly. Vibe coded with Claude

[Copilot]

Pull request overview

This PR fixes a bug in AddressFilter::from_str where the "all" keyword was incorrectly compared against the full input string s instead of the current range token inside the comma-splitting loop. This caused "all" to be treated as a range within the loop, where it would conflict with the overlap checking logic when combined with other ranges. The fix moves the "all" check outside the loop as a top-level special case.

Changes:

• Restructured from_str to handle "all" as a top-level special case before the comma-splitting loop, fixing the s == "all" vs range == "all" bug.
• Added comprehensive unit tests covering all parsing paths: "all", "?", single address, range, compound filter, error cases (end-before-start, overlapping, missing prefix, nested all), and empty filter.

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