Add support for logging multiple client's IP addresses to the access log

[maskit]

10.4. Migration
Certain HTTP implementations use the client address for logging or access-control purposes. Since a QUIC client’s address might change during a connection (and future versions might support simultaneous use of multiple addresses), such implementations will need to either actively retrieve the client’s current address or addresses when they are relevant or explicitly accept that the original address might change.

We also need to think about which address we should log when ATS is configured to log access in existing format (we would need to adjust it later after other apps decided the address they log).

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