Update Ip6Address::FromString to support address with interface

[sunytt]

Add support for address that are in the form of "fe80::1234%eth0".

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 45.92%. Comparing base (2b41187) to head (6bcc5c5). Report is 880 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2616 +/- ## ========================================== - Coverage 55.77% 45.92% -9.86% ========================================== Files 87 106 +19 Lines 6890 12627 +5737 Branches 0 915 +915 ========================================== + Hits 3843 5799 +1956 - Misses 3047 6511 +3464 - Partials 0 317 +317 ```

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